This isn't a game of Civ, life is not a "competition", yet somehow, we've managed to turn it into one.
"Nation-states" aren't going to work. We can see it now, the UK is scrambling to pick itself back up after Brexit, Israel and Pakistan have been in an uneasy state for quite some time, and it's highly obvious that our "nation of states" is starting to come apart at the seams. Quite frankly, it's high time to federalize the entire nation, no more "United States of America", just "America". You say that domestic politics is ugly, but politics between two different nations is far uglier.
"Acting with prudence" is not the promotion of one group over all others, acting with true prudence would be breaking down the barriers we've put between ourselves, stop thinking in terms of "blacks" and "whites", and cooperate as people. Instead, you only want to put up physical, geographical, and legal barriers, but also reinforce cultural ones.
You still voted for him.
Regardless, you're set in your willful ignorance, and I'd likely be making greater use of my time by bashing my head into a wall repeatedly.
Your ideology has caused immense harm to many people, and will continue to do so until the movement itself dies out.
Be on the wrong side of history if you want, I'm tired of this "debate".