Migration Policy Institute
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A significant share of unauthorized immigrants in the United States entered with a valid visa and then simply never left, overstaying the terms of their visa
US Politics
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fortified walls did not prevent crossings into the United States and European Union entirely, but instead shifted flows to other locations that were more remote or less fortified. In the U.S. case, as high-traffic urban routes were closed, migrants and smugglers began to cross in the remote and dangerous deserts of western Arizona.
US Politics
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Child migration from Central America to the United States, which surged in 2014, has also been undeterred by enforcement (in fact most unaccompanied minors turn themselves in to border agents), as tens of thousands of children from El Salvador, Honduras, and Guatemala spontaneously arrive at the U.S. border with Mexico to claim asylum, many knowing they would be admitted into the U.S. pending removal hearings
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