War
Cycles
Previously I have shown that the Strauss
and Howe saeculum is aligned with Kondratiev price
cycles
before 1650. The Kondratiev cycle at this time was shown to be consistent with
a lagged Malthusian
population growth model. Table 1 presents these Kondratiev cycles in terms
of its half-cycle or Kondratiev wave. Kondratiev waves are typically defined as
alternating periods of high and low inflation rate, but in this case they are
periods of alternating high and low price level. This is because the Malthusian
model predicts alternating periods of feast and famine that should be associated
with low and high price levels, respectively. In all but one case the expected
correspondence between the theoretical cycle driver and price level was seen. Also
shown in the figure is socioeconomic stress, defined as the frequency of social
unrest divided by the frequency of construction starts for religious buildings.
The former is a measure of social turmoil while the latter is an economic
indicator (presumably, famine period should be associated with both high price
level and low rate of construction starts, giving a large ratio between the two
(high socioeconomic stress). Feast periods would show the reverse, a small
ratio and low socioeconomic stress. With two exceptions, periods of feast or
famine correlated with low or high socioeconomic stress, respectively.
Table 1. Pre-1650 long
cycles showing the action of the Malthusian population model (data from Table 1
in population model)
Turning |
Kondratiev wave |
Driver |
Price |
Socioeconomic stress |
-- |
1176-1202 |
Feast |
Low |
Low |
-- |
1203-1230 |
Famine |
High |
High |
-- |
1231-1254 |
Feast |
Low |
Low |
-- |
1255-1282 |
Famine |
High |
Low |
-- |
1283-1305 |
Feast |
Low |
High |
-- |
1308-1328 |
Famine |
High |
High |
-- |
1329-1352 |
Feast |
Low |
Low |
-- |
1353-1381 |
Famine |
High |
High |
-- |
1382-1405 |
Feast |
Low |
Low |
-- |
1406-1435 |
Famine |
High |
High |
1435-1459 |
1436-1459 |
Feast |
High |
Low |
1460-1487 |
1460-1487 |
Famine |
High |
High |
1488-1517 |
1488-1520 |
Feast |
Low |
Low |
1518-1542 |
1521-1557 |
Famine |
High |
High |
1543-1569 |
1558-1579 |
Feast |
Low |
Low |
1570-1594 |
1580-1602 |
Famine |
High |
High |
1595-1621 |
1603-1626 |
Feast |
Low |
Low |
1622-1649 |
1627-1650 |
Famine |
High |
High |
A
long cycle in Anglo-American history which I call the PE cycle has been
approximately aligned with the Straus and Howe saeculum since 1720. The paradigm model was developed
to explain both cycles for the period since ca. 1820. This paper attempts to
address the period between 1650 and 1820 that is not covered by either model.
The PE cycle was defined as a consensus
between the Schlesinger political cycle and an economic cycle based on dates
for financial crises. The political cycle begins with the American revolution, and the first financial crisis which had an
impact on American politics was in 1772. Between 1774 and 1860 the PE cycle
periods were fairly well aligned with Kondratiev waves, as were the
corresponding Strauss and Howe turnings. The alignment between turnings and
Kondratiev waves continued further back and the PE cycle was extended before
1774 to 1720 using the consensus dates from Goldstein1 for these
waves. Before 1720 the alignment ends and the PE cycle is considered to have
begun them.
Table 2 adds the 1650 peak and 1689
trough (dating from Goldstein1) to give a set of eight periods
between 1650 and 1860 that correspond to Kondratiev waves, exactly before 1774
and approximately afterward. These periods were analyzed in terms of inflation
rate, unrest frequency and war intensity. Statistically significant relations
were seen with all three: upwaves are times of inflation, increased war and
lower unrest; downwaves are the opposite. That is unrest was inversely correlated
with price: high prices/inflation were good times with low levels of unrest.
Before 1650 unrest was directly correlated with price: high prices/inflation were bad times with high levels of unrest. This shift in
social and economic interactions implies that a new cycle mechanism had come
into play after 1650.
Table 2. Socioeconomic
dynamics of long cycles over 1650-1860
Turning* |
PE period |
Description |
Unrest events |
Inflation rate |
War Deaths per 100K pop. |
1649-1675 |
1651-1688 (A) |
Recession |
0.98 |
-0.8% |
25.3 |
1675-1704 |
1689-1719 (I) |
Prosperity |
0.58 |
0.9% |
71.9 |
1704-1727 |
|||||
1727-1746 |
1720-1746 (A) |
Recession |
1.38 |
0.2% |
16.1 |
1746-1773 |
1747-1774 (I) |
Prosperity |
0.79 |
1.0% |
43.8 |
1773-1794 |
1774-1792 (A) |
Recession |
1.00 |
1.0% |
11.0 |
1794-1822 |
1793-1823 (I) |
Prosperity |
0.45 |
0.8% |
66.3 |
1822-1844 |
1824-1842 (A) |
Recession |
1.96 |
-1.1% |
2.2 |
1844-1860 |
1843-1859 (I) |
Prosperity |
0.43 |
1.5% |
11.3 |
Average (n=4) |
|
|
-0.16% |
48.3 |
|
Average 1650 (n=4) |
|
1.33 |
1.05% |
13.7 |
|
|
p <= |
|
3.8% |
3.7% |
4.0% |
*Social moment turnings (crises and awakenings) in bold
Numerous observers, including Kondratiev,
noted an association between upwaves and concentrations of war. Figure 1 shows a plot of
war intensity, defined as deaths in great power2 wars per 100,000 population.1 War intensity shows 50-year
cycles from the late 16th through early 20th centuries
(see Figure 1).
Concentrations of war do tend to occur during upwaves, which is reflected in
the average war intensities in Table 2. These concentrations of war can be characterized
in terms of the largest war within it, which is called a peak war. This
terminology reflects a rough correspondence between the peak wars and
Kondratiev peaks. The peak wars relevant to America are the War of Spanish
Secession (Queen Annes war),
Seven Years War (French & Indian war), the War of 1812, the American Civil
War and World War I.
Figure 2 shows a plot of
British imports3 relative to their long term trend over the 18th
century. Since colonial America was a key supplier of these imports, this data
can give some insight into economic trends in the colonies. Also shown is a
plot of US real unskilled labor costs4 for the 1790-1860 period. Figure 2 shows downturns
in trade over 1724-46 and 1775-1790 and a period of zero wage growth over 1824-46.
Figure 3 shows a
continuation of the labor cost trend over 1850-1940. Real per capita GDP5
relative to its long trend is also plotted as a second economic indicator. The
period is broken into four eras: 1846-1893 when wages were rising and GDP
growth was above trend; 1893-1915 when wages were flat and growth was below
trend; 1915-1929 when wages were rising and growth was on trend; and 1929-1940,
which corresponds to the Great Depression. Two of these eras, 1893-1915 and
1929-1940 define periods of long-term economic decline. These two eras roughly
correspond to periods of rising/elevated unrest (Figure 3). Table 3 presents
these five periods of economic decline along with the end of the preceding peak
war. Shortly after the end of the peak war and before the start of the downturn
were the beginnings of war debt reduction (austerity). Dates for this are given
in Table 3. Finally, dates for major financial crises associated with turning
points in the PE cycle are given.
Table 3. Clustering of cycle turning points, peak wars, peak debt, panic and
depression.
Peak War |
War end |
Start of
austerity |
Downturn |
Financial
crisis |
Consensus turning point |
PE active
period |
Social moment
turning |
War
of Spanish Secession |
1713 |
1717 |
1724-1746 |
1720 |
1721 |
1720-1847 |
1727-1846 |
Seven
Years War |
1763 |
1765 |
1775-1790 |
1772 |
1771 |
1774-1892 |
1773-1894 |
War
of 1812 |
1814 |
1819 |
1824-1846 |
1819 |
1821 |
1824-1842 |
1822-1844 |
Civil
War |
1865 |
1870 |
None |
1873 |
1869 |
1860-1873 |
1860-1865 |
None |
-- |
-- |
1893-1915 |
1893 |
1892 |
1896-1919 |
1886-1908 |
World
War I |
1918 |
1922 |
1929-1940 |
1929 |
1927 |
1930-1946 |
1929-1946 |
The
sequence of events in four of the six entries in Table 3 are
consistent with the following model. Fighting wars results in
a substantial increase in government outlays, which acts as an economic
stimulus, increasing economic output and the price level. Hence periods
when wars are fought should show inflationary prosperity, which is reflected in
low levels of unrest and inactive periods in the PE cycle. Spending for wars
leads to growth in government debt. At some point after the wars have ended,
the government will begin to pay down its war debt by running budget surpluses
(austerity). Imposition of austerity produces a disinflationary economy prone
to financial crisis and prolonged economic downturns. Eventually both happen,
triggering rising unrest and the beginning of an active period in the PE cycle.
This sequence of events typically takes about a decade. I call this mechanism
the war model.
The
model breaks down for the Civil war. The expected sequence of end of the peak
war, start of austerity, and financial crisis occurred, but the downturn did not
materialize. Although the Panic of 1873 triggered the longest recession in
American history, it was followed by a very strong recovery. The entire postwar
era saw a rising trend in real wages (Figure 3). Not
surprisingly there was no significant rise in unrest for two decades after the
war. The 1860s do correspond to an active period and crisis turning, but both
of these began before the Civil War. In fact it was the war itself, not an
economic downturn, that was the driver for the crisis.
Furthermore, a period of economic downturn beginning with the panic of 1893 and
which showed elevated level of unrest was identified (Table 3). This period also
corresponds to an active era in the PE cycle and an awakening turning, but it
has no peak war. Two successive failures of the war model indicate that
sometime between the War of 1812 and the Civil War, the war mechanism was
replaced by another. This new mechanism was the paradigm mechanism previously described.
Historical
action of war-linked financial crisis in the generation of active periods and
social moments
The
population model was still valid at the 1650 Kondratiev peak, but by the next
peak in 1720 the war model was applicable. The unusually long Kondratiev cycle
between these two dates contained three turnings instead of the normal two: an unraveling
turning over 1649-75, the Glorious Revolution Crisis over 1675-1704 and a high turning
over 1704-1727. Key reforms enacted as a result of the Glorious Revolution were
responsible for the appearance of the war mechanism.
The
direct result of the revolution in 1688 was the installment of a new king, William
III, who recognized Parliament as a co-equal partner with the monarchy. When
William proposed war with France, Parliament duly declared war in May 1689. The
Commons, which had been responsible for authorizing war supply since the 15th
century, deliberately kept William underfunded, requiring frequent war spending
authorizations by Parliament, which kept Parliament in session almost
continuously.6
Parliament
developed innovative new taxes which were actually paid because they were seen
by the public as legitimate because they came from Parliament. This established
a regular means for securing government income that could be adjusted to actual
needs. Parliament established a Commission of Public Accounts in 1690 to
monitor government expenditures by the Crown and began inserting appropriations
in its revenue bills that directed how the money was to be spent.6
Through
these provisions Parliament gained control over the government budget, which
helped ensure the success of the new central bank created in 1694.6 Not
only was there now public control over government finance, budgetary issues
were now explicit, allowing proper analysis of government debt as an investment.
This created a direct link between government finance and the London financial
and commercial community. In 1698 John Castaing began to issue a list of stock
and commodity prices called The Course of
the Exchange and other things at Jonathans Coffee House. It is the earliest
evidence of organized trading in marketable securities in London.7
These
innovations, collectively called the Financial Revolution, created market mechanisms
through which wars could directly affect financial markets, leading to price
rises (bubbles) and declines (financial crisis). An excellent example of this
is the South Sea bubble. The South Sea Company was formed in 1711 as Tory competitor
for the Whig Bank of England.8 The company was granted a monopoly on
all British trade with the Spanish colonies in South America (then called the
south sea trade) in exchange for taking over and consolidating the national
debt. Consolidation meant getting owners of pre-existing loans to exchange them
for South Sea company stock that paid a dividend that was smaller than the
interest payment on original loan, which saved the government money. Holders of
the loans were willing to do this for two reasons: (1) the stock was a liquid
asset and so carried a liquidity premium, and (2) the stock had a potential for
capital gain that the existing debt did not. What the South Sea company did was
convert government debt from an investment (asset purchased for the income it
provides) into a speculation (assets purchased for their capital gains
potential). This is analogous to the recent practice of converting conventional
mortgage loans into tradable mortgage securities.
The
outcome was similar to what happened three centuries later. After the company
directors circulated false claims of success in the South Sea trade the stock
took off.8 Speculative fires were stocked when the government
endorsed the company proposal for addition debt conversion over that of the
Bank of England.8 The rising price of company stock helped spur
general interest in the stock market as did the internet bubble. By the middle
of 1720 market was flooded with a remarkable range of new ventures (the Pets.com
of their day). Parliament passed the Bubble Act to outlaw the formation of
these companies in an effort to prop up South Seas stock by minimizing
competition for investor money. The stock peaked in early August and collapsed soon
after (Figure 4). It continued
to fall well into the next year, devastating institutions and individuals alike.8
Although historians have often assumed
that this crisis, like later ones, had serious economic consequences, there is
little statistical support for this.9 As
shown in Figure 2, a downturn in
trade volume relative to trend began years after the crisis. It did have
serious political consequences, however, but these did not extend to America. This
is not the case for the next war-linked financial crisis in 1772. Although the
direct impact of the crisis was on the City of London, it exerted indirect
effects that led to the American revolution as described by Schwarz:10
In
the summer and fall of 1772, panic took hold of Londons financial circles. It began with the collapse
of a firm called Neale, James, Fordyce, & Down. Alexander Fordyce had been
speculating successfully for a decade, but in the early 1770s his investments
went sour. He managed to deceive his partners for a while; according to one
biographer, It is said he succeeded in quieting their
fears by the simple expedient of showing them a pile of bank notes which he had
borrowed for the purpose for a few hours. When things got too hot, though,
Fordyce skipped town owing a hundred thousand pounds. In early June his firm
suspended payment of its debts.
In
a generally overextended market many other firms were just as vulnerable, and
the dominoes started falling. By the end of June twenty major houses had
collapsed. Those that were left suffered the usual squeeze: Debtors were slow
to pay, while creditors were quick to demand payment. Among the hardest hit was
the already foundering East India Company, which had a monopoly on trade,
chiefly in tea, with the British Asian colonies.
In
September the company took out a loan from the Bank of England, to be repaid
from the sale of goods later that month. But with buyers scarce, most of the
sale had to be postponed, and when the loan fell due, the company coffers were
empty. On October 29 the bank refused to renew the loan. That decision set in
motion a chain of events that made the American Revolution inevitable.
The
East India Company had eighteen million pounds of tea sitting in British
warehouses. Selling it in a hurry would do wonders for its finances. The
American market beckoned, but there were two problems. First of all, the
company was required by law to sell its tea to the highest bidder in England,
letting merchants there and in America ship and resell it. Second, tea sold in
America carried a tax of three pence a pound, which made it unpopular with restive
colonists.
After
prolonged wrangling, in May 1773 Parliament let the company eliminate the
middleman and market the tea itself through its own American agents. It also
refunded duties that the company had paid upon bringing the tea to England.
With these changes the East India Company could easily undercut the smugglers
who had been taking much of its business. On the tax issue, however, the
government would not budge. While admitting that three pence a pound yielded
negligible revenue, it insisted on maintaining British taxation power over its
colonies.
It
seemed a perfect compromise: The company would make
money, the colonies would get cheap tea, and Britain would uphold its rights.
So the government was quite surprised when citizens in Charleston,
Philadelphia, New York, and most famously Boston vigorously rejected the
tainted tea. Their tea parties showed that America would not be bribed into
accepting taxation without representation. Yet that was not the only issue.
There
was nothing new about the tea tax. Colonists had been paying it--and similar
taxes on sugar, molasses and win--for years. The new and obnoxious feature of
the Tea Act was the monopoly for the East India Company, which would deprive
American merchants of their business in both legal and smuggled tea (and which
they feared would be extended to many other goods). By
alienating this wealthy and powerful group, the British united self-interest
and revolutionary fervor in a combination that would soon destroy the colonial
bond. Just as the failure of a single bank had caused a financial panic, so too
did a seemingly innocuous attempt to collect a tax that was already on the
books lead directly to the American Revolution.
Within
two years of the tea parties, armed rebellion had broken out, which expanded to
full-scale war by the next year. The outbreak in hostilities led to the
downturn in trade that began in 1775. So the crisis of 1772 led to both
political and economic changes consistent with the start of an active period or
social moment turning and can be considered as a triggering event for both.
The
role of the Panic of 1819 in the rise of Jacksonian populism that characterized
the 1824-1842 active period in the PE cycle was previously discussed. This crisis
ended the Era of Good Feelings by accentuating political division over the role
of the central bank in the panic. In time these divisions became formalized in
the establishment of the Democratic and Whig parties, and the rise of the
paradigm mechanism. Here the war-induced financial crisis gave rise not only to
economic stress and its associated unrest, but also to political forces that
produced a liberal era and the paradigm derived from it.
As
described earlier, the next war-linked financial crisis, the Panic of 1873, did
not play a role in initiating a social moment turning or active period for a
crisis turning and active period in the PE cycle. Financial crisis continued to
be a factor in producing active eras/social moment turnings after 1873. In
fact, in three of the four active eras/social moment turnings after the Civil
War, financial crises (in 1893, 1929 & 2008) played important roles. Since
1720, only two of the eight active eras/social moments have not involved
economics as a dominant factor. Both of these (Civil War and Civil rights era)
had triggering events associated with an overriding social issue (race
relations).
The
genesis of the modern politically-driven cycles (war and paradigm) was the
financial revolution associated with the Glorious revolution. Strauss and Howes generational cycle characterizes this period as
secular crisis, a period that addresses the outer world of institutions, as
opposed to the spiritual awakening, which addresses the inner world of private
belief and behavior. Social moments correspond to active eras in the PE cycle,
but the PE cycle methods do not apply to this time, nor do the social dynamics support
a Glorious Revolution social moment, (unrest was not particular high at this
time). This period occurs outside of the scope of my empirical cycle methods,
although it is undeniably a crisis era in the sense that Strauss and Howe use. It
is only after this crisis that the patterns characterizing the PE cycle became
valid.
From the very beginnings of financial
markets in the wake of the Glorious Revolution, finance has been intertwined
with politics, with the latter in the drivers
seat. Initially, it was war policy by the monarch that was the driver. Quincy
Wright, who was first to characterize the war cycle, proposed a number of
factors as possible causes for periodicity of war. One
factor were alternating hawk and dove generations: The warrior does not wish to
fight again himself and prejudices his son against war, but the grandsons are
taught to think of war as romantic.12 The financial impact of these
cyclical wars produces cyclical unrest that defines the PE and turning cycles. With
the rise of mass democracy, I have proposed dominant and recessive paradigmic
generations to replace hawk and dove generations, but it is still the impact of
politics on policy affecting the economy and society that gives rise to active
eras and social moments. For example the recent financial crisis was made
possible by decades of supply side economic policy introduced as part of the
Freedom paradigm established during the 1966-1981 active era. Since then, high
interest rates, as opposed to high taxes, have been the preferred means to
control inflation, which penalizes capital-intensive industries like
manufacturing, to the benefit of finance. Preferential tax treatment of capital
gains over income encourages speculation as opposed to investment, much as did government
sponsorship of the South Sea company.
Development
of the War Cycle
As Figure 1 shows, there is
some evidence for the cycle existing as early as the late 16th century, and certainly during the first half of the 17th
century. Early 16th century wars showed no evidence of cycles (see Figure 5). Interactions
between war finance and the Kondratiev cycle can explain the rise of the war
cycle. Wright proposed that financial constraints force temporary cessations of
war expenditure to give the economy time to recovery: there is a tendency to
postpone a new war until there has been time to recover economically from the last.13
The scale of warfare had grown
tremendously during the 16th and early 17th centuries culminating in the
cataclysm of the Thirty Years War, a phenomenon called the Military revolution.
This growth placed a severe strain on the ability of nations to pay for the
wars they fought. Spain was the only belligerent involved in all these major
wars and for whom the problem of payment was most acute, Despite the steadily
increasing stream of silver and gold from their American colonies, Spain
underwent no less than seven state bankruptcies over the 1500-1650 period.14,15
Most of these bankruptcies came from excessive war-spending. The bankruptcies
of 1557 and 1607 more or less forced the Treaty of Cateau-Cambresis
in 1559 and the truce of 1609 which established the de facto independence of the Netherlands from Spain. Spain never
learned to reign in her ambitions and when the growth in flow of American
treasure slowed in the 1630s, she began a permanent decline that ended her days
as a great power by the end of the century. As the Spanish captains used to
say, victory went to him who has the last escudo.15
The example of Spain could serve as an
object lesson in the problems that came from ignoring finance. The other
European powers had the luxury of not always being involved in conflict, and so
were better able to time their war-fighting so as to avoid fiscal catastrophe. The
population-derived Kondratiev cycle created alternating periods of higher or
lower inflation. The former were good times to incur debt since it could be
repaid using less valuable currency. Hence there was a natural tendency for
wars of choice to cluster during upwaves, giving rise to a war cycle aligned
with the Kondratiev cycle as depicted in Figures 1 and 4. That is, price
cycles of feast/famine(and the associated good/ bad
times) induced cycles of peace/war, which, as the financial revolution
unfolded, induced cycles of depression/prosperity (associated with bad/good
times). That is, around the time of the Glorious revolution, the alignment
between unrest and price shifted from inflation being bad (famine) to inflation
being good (prosperity). Such a shift would necessarily affect the alignment
between Kondratiev cycles and the saeculum. The 1650-1843 period
contains 3.5 Kondratiev cycles of 55 years, implying a saeculum length of 110
years at the normal ratio of two Kondratievs per saeculum. The shift in
alignment caused by the financial revolution forced the addition of one extra
turning in order to avoid sequential social moments. This means that two
saecula fell into the 1650-1843 period containing only 3.5 instead of 4 Kondratievs.
This implies a shortening of the saeculum length from 110 to 96 years. The actual
average saeculum length for the two saecula before 1649 was 107 years, compared
to 94 years for the two after.
Summary
This graphic summarizes the various long
cycles I have described in terms of when they were operative The first four
rows describe an economic cycle, a generational cycle, a political and economic
cycle, and a war cycle. The next two rows show when the three models I have
presented were operational. Overlapping the beginning of each model is the
revolution that made the mechanism possible. The military revolution created
the need for finance, which led to the war cycle. The financial system created
to manage wars during the financial revolution spawned the war cycle, which
after the democratic revolution was replaced by the paradigm mechanism.
12th cent |
13th cent |
14th cent |
15th cent. |
16th cent. |
17th cent. |
18th cent |
19th cent |
20th & 21st cent |
|||||||||||||
|
50-year Kondratiev cycles |
Long K-cycle |
|||||||||||||||||||
|
Century-long saeculum |
Variable length saeculum |
|||||||||||||||||||
|
PE cycle |
||||||||||||||||||||
|
War Cycle |
|
|||||||||||||||||||
|
Malthusian Model |
|
Paradigm model |
||||||||||||||||||
|
War model |
|
|||||||||||||||||||
Revolutions: |
Military |
Financial |
Democratic |
|
|||||||||||||||||
References
1.
Goldstein,
Joshua S. Long Cycles, New Haven: Yale University
Press, 1988
2.
In 1650 the great powers were the Austrian empire, Britain, France, the
Netherlands, the Ottoman empire, Prussia/Germany,
Spain and Sweden. Sweden, the Netherlands and the Ottomans are dropped after
1715 while Russia is added. Spain drops out after 1800; the United States and
Italy are added after 1850.
3. British import volume is the
official value (in British pounds) of
imports. It was obtained from Mitchell (ref 13) for the period 1700-1853. A
second series of computed values is given for 1796-1853. The ratio of the
computed values to the official value shows a shape similar to the price index
over the 1796-1853 period. If the computed values are
divided by a price index to put them in real terms the resultant series is very
similar to the official series. Thus, the official trade statistics appear to
be a proxy for trade volume in real terms and so were used directly for
analysis.
4.
Lawrence
H. Officer and Samuel H. Williamson, Annual Wages in the United States, 1774-Present,
MeasuringWorth, 2014.
5. Samuel
H. Williamson, What Was the U.S. GDP Then? MeasuringWorth,
2014.
6. parliament.uk,
The Financial Revolution, Living Heritage The Glorious Revolution
7. London
Stock Exchange Our History
8. Harvard
Business School, South
sea bubble short history
9.
Hoppit,
J. (2002) The Myths of the South Sea Bubble, Transactions of the Royal Historical Society,
12: 141-165.
10.
Frederic
D. Schwarz, 1772: two
Hundred And Twenty-five Years Ago, American Heritage, 48(6), October 1997.
11.
Cycles in American History
12.
Wright,
Quincy, A Study of War, 1942; reprint ed. Chicago: University of Chicago Press,
1965, p 230.
13.
Ibid
p 1272
14.
Richard
Cavendish, Spanish Bankruptcy, History Today
15.
Spain then and
now;
16th C Spain. Overview: Politics.
16.
Kennedy,
Paul, The Rise and Fall of the Great Powers, New York:
Vintage Book, 1987, p xxiv.
17.
Mitchell,
B. R. British Historical Statistics,
Cambridge University Press, 1988.