In a 2018 Gallup poll, 158 million adults world-wide, including 42 million from Latin America, named the U.S. as their desired future residence. That’s almost half our current population of 325 million. We simply cannot accommodate all those would-be immigrants.

Whether it’s called an emergency, a crisis or something else, the surge of families and children entering illegally through our southern border is out of control. Since 2012, some 900,000 unaccompanied children and people traveling in families have entered illegally...