What was the last empire to exist?

At the beginning of the 20th century, there were 16 empires of varying size and reach. At the end of the century, there was just one: the United States.
 

How many empires ruled the world?

Empires, more than nation-states, are the principal actors in the history of world events. Much of what we call history consists of the deeds of the 50 to 70 empires that once ruled multiple peoples across large chunks of the globe.
 

What were the causes for the end of empire in world history?

Some of the broad factors that historians use to help explain imperial collapse are: Economic issues. Social and cultural issues. Environmental issues.

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