Trumpian foreign policy isn't new. It's an "America First" ideology that goes back to Andrew Jackson. Arguably it goes back to George Washington, and his famous resignation speech.

Playing nice with foreign empires, economic protectionism, domestic military action, an "all or nothing" attitude towards foreign wars, taking chunks of our neighbors back yards, etc.

This isn't new at all. It's exactly what FDR had to overcome to build the American Empire.