Ethnic Albanian refugees fleeing the conflict in Kosovo arrive in Macedonia on April 1, 1999.

A recent United Nations report showed that, for the first time since World War II, there are more than 50 million refugees in the world. Sometimes it's hard to wrap your head around just how many people have been displaced in conflict zones around the globe. In an effort to provide clearer context, the chart below compares the 10 biggest refugee populations with the populations of American cities:

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