Demonstrators wave flags of Mexico and the United States and cheer at a planned protest near downtown San Diego, California, May 1, 2006.
Fred Greaves / Reuters

To look around the world is to realize how fortunate the United States is to share a continent with friendly, stable, and democratic nations. Devastating conflicts in the Middle East, tense territorial disputes in Asia, a resurgent Russia, and now a historic threat to the European Union all underscore the extent to which North America offers the United States a uniquely advantageous strategic base.

But the relative calm and prosperity of this continent must not be taken for granted. The presumptive Republican nominee for president, Donald Trump, has proposed a set of reckless immigration and border security policies that would

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