When you go to bed at night, you probably lock your doors first. I lock mine, too, and it would be a generally poor idea for someone to dismiss the message of the locked door.
Likewise, when you have a party, you likely restrict attendance to those on your e-vite list (unless you're that pool party twit from McKinney), because - hey, salmon, champagne and caviar are expensive, and besides, you don't want unwelcome visitors looting your grandmother's Sheffield flatware.
Fueled by immigrant labor, the North American continent was linked coast-to-coast on May 10, 1869. Subsequent waves of newcomers helped build America's factories during the industrial revolution, its skyscrapers; harvest its crops and expand highways. But we've run out of room. With no frontier left to tame, people no longer migrate here to contribute, but because we've become the world's night shelter.
Here's hoping the next President can revive the American Dream, and put the nanny state in time-out.