The bigger problem is that the number of seats in the House has been frozen for about a hundred years. Our population exploded, but our number of representatives stayed static, so places with the most people actually get less representation in congress.
On top of this, the number of electors a state has its equal to the number of representatives that state has in the Senate and the House combined. So more populated states also get underrepresented in the presidential election.
The Three-Fifths Compromise was absolutely fucked, but it's not what is deadlocking the House now and its not what is letting a people lose the popular vote and still go on to be president in 21st century elections.
Because last time his number one policy promise was to build a wall and have Mexico pay for it. And his number two promise was an alternative to Obamacare.
He's not so great at following through with his promises. That's the only thing non-MAGAs have going for them: he's pretty incompetent.