The United States saw huge growth in Mexican immigrants over the last year, a shift that the Center for Immigration Studies pins on relaxed border enforcement under President Obama and a steadier economy that is enticing more people to find work north of the border.

In a new report released early Thursday morning, CIS said the total Mexican immigration population in the United States stands at 12.1 million people as of this year, a jump from 11.4 million a year ago.

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