By Aku Ammah-Tagoe
In the modern era of foreign relations, it’s hard to imagine a single government controlling most of the globe. But as recently as the 20th century, superpowers were more than diplomatic giants: they were empires that spanned one or more continents, and their patterns of ascent and decline are still relevant today. Here’s a look at how empires rise, and why they fall.
Published: July 1, 2009
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