World War I
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
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...1914 18, also known as the Great War, conflict, chiefly in...factors that had led toward war. Prominent causes were the...Lorraine by the Franco-Prussian War of 1870 71, had been left with...almost until the onset of the war, an optimism stimulated by the long period during which major wars had been avoided, by the close...