> what we learned from the unrest that the U.S. faced during the Vietnam war era.

That the counterculture and the Communists were actively trying to make us lose a war? The author of this discusses real problems with the US -- situations like Guatemala, where we backed a feudal aristocracy, or Iran, where we set the country back considerably by helping overthrow Mossadeq -- and not just conspiracies carried out by our enemies.

Thinking about the meaning of "empire", I wonder if it would've been better for the US to have made various outright annexations after WWII. Not having to deal with an independent local government, or with self-interested local elites, makes things clearer and easier; the US's interventions in El Salvador or Guatemala would've been significantly less nasty if they had begun with annexation and the extension of domestic policies like EITC, Social Security, and property tax...