Professor Erika Lee speaks with The World's Marco Werman about how the US has responded with changes to immigration policy and increased xenophobia during times of war, economic hardship and disease throughout history.
Twice in the last half-century the US has tried to use the border to force Mexico to bend to America’s will. The ruse failed both times. The history suggests that threats of border closure may be politically useful, but are never a real answer to human tragedy.
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