Things to know about Europe’s migrant crisis at land and sea

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NEW: 2,748 migrants die so far this year in Mediterranean, or 73% of those worldwide

European external borders are considered the world's deadliest for migrants

22,400 migrants died trying to reach those borders between 1996 and 2014

CNN  — 

For all the presidential candidates’ uproar over the U.S.-Mexico border, the world’s biggest migrant crisis actually lies with the European Union, reeling from mass deaths on land and sea.

In the span of just a week in August, 71 refugees were found dead in a truck in Austria, and scores of other migrants died off Europe’s shores yet again.

Indeed, the Mediterranean Sea is called the world’s deadliest borde