By Lori Hinnant and Jamey Keaten, The Associated Press

They are trapped in squalid detention centers on Libya’s front lines. They wash up on the banks of the Rio Grande. They sink without a trace — in the Mediterranean, in the Pacific or in waterways they can’t even name. A handful fall out of airplanes’ landing gear.

As their choices narrow on land and at sea, migrants are often seen as a political headache in the countries they hope to reach and ignored in the countries they flee. Most live in limbo, but recent tragedies have focused attention on the risks they face and the political constraints at the root of them.

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From Libya to Texas, tragedies illustrate the plight of migrants