The Byzantine Empire fell in 1453. The immediate cause of its fall was pressure by the Ottoman Turks. The Ottomans had been fighting the Byzantines for over 100 years by this time. In 1454, Constantinople finally fell to them and their conquest of the Byzantine Empire was complete<span>.</span>
If this is during WWI then this could spread to widespread war because of the alliance systems
<span>Differences between the North and the South were readily apparent well before the American Revolution. Economic, social and political structures differed significantly between the two regions, and these disparities only widened in the 1800s. In 1861, the Civil War erupted between the two sides, and much of the conflict surrounded sectional differences. Once the war ended, Reconstruction lessened some sectional disparities but increased others.</span>
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