Vietnam, Iraq, Iran in the 50s, Chile in the 70s, Israel/Palestine since the beginning, the list goes on. Hell, even in WWII where the USA was ostensibly on the "right side" of the war, the USA ended it in such an profoundly evil way by dropping two nuclear bombs, killing thousands and thousands of people. There's a good list of US-invovled regime change on Wikipedia, for anyone looking for a starting place: https://en.wikipedia.org/wiki/United_States_involvement_in_r...
Besides armed conflict, the way the USA exploits the third world in the name of mining resources and cheap manufacturing is abhorrent. Conditions that are illegal within the USA's borders are common elsewhere, and then the USA turns a blind to that suffering while enjoying cheap food, clothes, and gadgets