WASHINGTON — The immigration enforcement regime at the U.S.-Mexico border offers a vivid example of how existing policies, laws and resource investments are markedly out of step with new migration realities and future needs. A border enforcement system designed to address the once-dominant flows of single adults from Mexico seeking to enter the United States illegally for work is ill prepared to deal with today’s more complex mixed flows of families and unaccompanied children from Central America, some seeking humanitarian protection, others opportunity.
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