It has been interesting watching the political parties evolve.
The Cold War Republicans I was born into were basically an uneasy alliance of globalists and nationalists.
The globalists supported free trade deals and were generally moderate on social issues. They would advertise themselves as fiscal conservatives. There was also a progressive sub-faction; the Rockefeller Republicans.
The nationalists were quietly america first, leary about free trade, and strongly social conservative.
The uniting principles were beliefs in lower taxes, less government, deregulation of business, domestic free markets, and especially opposition to the Soviet Union.
The globalists / moderates / fiscal conservatives pretty much ran the Party. The nationalists / social conservatives stayed in the background unless needed to rally pro-lifers, etc.
The collapse of the Soviet Union fractured the alliance. The first overt sign was probably the emergence of Ross Perot and his ant-nafta reform party. Then the tea party. Now, with Trump, the nationalists have taken over the Republican Party.
Personally, I am still a libertarian at heart. I would prefer tree trade and open borders with little or no government.
That fails because humans are largely stupid, greedy, mean bastages who lie, steal, and cheat. Those are the ones who don't rape, main, and murder.