The European Union is currently enjoying a 70-year period of calm. It spans more over two thousand years, making it the longest in history, Prior to the start of World War 1 1914.
In 1914, Europe was an armed camp, with two competing coalitions dominating its politics. The unified Germany formation was in 1871 threw Europe's previous "balance of power" into disarray. In 1894, fear of Germany prompted France and Russia to forge an alliance.
Thus, 70-year period peace had Europe witnessed.
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