Democratic presidential candidate Joe Biden speaks about the coronavirus at The Queen theater in Wilmington, Del., Oct. 23, 2020 (AP photo by Andrew Harnik).

Should Joe Biden win the American presidency on Nov. 3, the world will experience whiplash, as the United States performs a second about-face in its posture toward multilateralism in only four years. Although the U.S. has oscillated through cycles of internationalism and isolationism before, it has never executed such a swift and dramatic double-reverse. A Biden triumph would repudiate the “America First” platform on which Donald Trump won the White House in 2016, and the hyper-nationalist, unilateralist and sovereigntist mindset that undergirds it. Such a stunning shift in America’s global orientation would have major implications for global cooperation on everything […]

Then-U.S. Vice President Joe Biden, right, speaks with Jimmy Morales, Guatemala’s president-elect at the time, in Guatemala City, Jan. 14, 2016 (AP photo by Moises Castillo).

From the start of the 2016 election campaign, it was all too clear that a Donald Trump presidency would bring dramatic and destabilizing changes to U.S. foreign policy, especially in Latin America. Candidate Trump publicly pummeled the region, fulminating about “rapists” and drug traffickers crossing from Mexico, and vowing to build a wall to keep Central American migrants from “invading” the United States. The rhetoric was jarring in itself, but it was even more startling because it represented such a sharp departure from President Barack Obama’s administration, when even the most critical measures or sanctions came wrapped in diplomatic language. […]