Canada, our enemy to the north. California, our enemy to the west. New England,
Our enemy to the northeast. Mexico, our enemy to the south. Russia and the South a bunch of very fine people. Donald Trump President of some of the United States and our good friends, the Russians. 
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and this fits. White male supremacist, Pat-Buchanisism nationalism. They want to put a wall around our nation to protect America from all those different, dangerous "others" out there.
But then there's the little problem of all the others within. An inevitable next step, and how to "Make America Ozzie and Harriet Again" certainly wouldn't be limited to the problem of undocumented immigrants.
These days too many of our conservative neighbors see most Americans as enemies to be defeated. Of course, being them, they haven't quite faced up to this reality, much less begun to think this through.
Btw, for a large portion of the right, and many ex-Dem white male working class trumpsters, restoring the Harriet in women is clearly a priority. Women are half of all Americans, and we're not only refusing to date, much less marry, rejected millions of less desirable males, we're taking their jobs. Enemy.
VOTE DEMOCRAT!