1815 Waterloo
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Today is June 18, and on this date in history, in 1815, we witness the Battle of Waterloo fought in present day Belgium between the Empire of the French, under the great Napoleon Bonaparte and the coalition under the equally great, Arthur Wellesley, the Duke of Wellington.
It was the decisive battle at the end of the Napoleonic Wars and sealed the fate of the Emperor, Napoleon. Modern Europe resulted from the battle, and a general war did not break out for almost 100 years, 1815-1914. Waterloo allowed Europe to grow and prosper to the extent that it built the modern world.
Scores, if not hundreds of books, appear on the this battle, and it was, indeed, a crucial event in history. It basically started the modern age and ended the old era of aristocratic ascendancy. Hereafter, nationalism, the virus started in Europe by the French Revolution and spread by Napoleon, increasingly came to the fore. Another spawn of the French Revolution, Marxism, also started to spread. Imperialism, another affliction from the French Revolution increasingly became apparent.
The wars of the 19th Century were wars of Nationalism and Imperialism. WWI was really the last war of the 19th Century.
The wars of the 20th century generally were wars the various ideologies, Nazism, Fascism and Communism, attempting some degrees of world dominance. At the end of the century democratic imperialism came front and center.
It is too early to tell what "ism" will drive the 21st Century, but imperialism appears to be holding is own.
As a footnote, the battlefield has been greatly altered by the building of a mound with a monument by the King of the Netherlands who was able to grab Belgium for a couple of decades after Waterloo. His worthless son, the Prince of Orange, had been wounded at Waterloo. (If you have read Cornwell's Sharpe series, in Sharpe's Waterloo, it was Sharpe, himself who shot the Prince of Orange, who had ordered the slaughter of units of good soldiers through his fecklessness and incompetence.)