Foreign Affairs has a good article on The Self-Destruction of American Power, looking at where it all went wrong, from the World’s sole superpower after the fall of the USSR to the modern day retreat from any sort of international cooperation.
The Trump administration has hollowed out U.S. foreign policy even further. Trump’s instincts are Jacksonian, in that he is largely uninterested in the world except insofar as he believes that most countries are screwing the United States. He is a nationalist, a protectionist, and a populist, determined to put “America first.” But truthfully, more than anything else, he has abandoned the field. Under Trump, the United States has withdrawn from the Trans-Pacific Partnership and from engaging with Asia more generally. It is uncoupling itself from its 70-year partnership with Europe. It has dealt with Latin America through the prism of either keeping immigrants out or winning votes in Florida. It has even managed to alienate Canadians (no mean feat). And it has subcontracted Middle East policy to Israel and Saudi Arabia. With a few impulsive exceptions—such as the narcissistic desire to win a Nobel Prize by trying to make peace with North Korea—what is most notable about Trump’s foreign policy is its absence.