By Astrid Galvan, The Associated Press

An unprecedented number of families have been coming to the southern border over the past year, straining government resources and resulting in dangerously overcrowded detention facilities.

From October through the end of June, the Border Patrol apprehended more than 688,000 people, over half of them families and unaccompanied children. Although people from all over the world enter the United States via the Mexican border, the vast majority come from Guatemala, Honduras and El Salvador, three Central American countries where violence and poverty have gripped many lives.

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Photo: U.S. Customs and Border Protection

By the Numbers: Migration to the U.S.-Mexico Border