Your effect? 70 years Americans are sitting in South Korea, the effect is that all presidents and prime ministers were either overthrown as a result of military coups, or killed, or ended up in prison for crimes.
The US effect in Asian countries... well, it's inconvenient to even remember about Afghanistan, the wounds are too fresh, although the guppy fish have already been forgotten, after all, a whole year has passed since fleeing Afghanistan... The effect of US there gorgeous!
There was also an effect in Vietnam - all the governments of South Vietnam were distinguished by venality, corruption and cruelty (oddly enough, Ukraine is also famous for corruption, one of the last lackeys of the United States, on which they also have an effect).
What is the effect of the US on neighboring Haiti, where the US has intervened many times and it looks like they are going to do it again is on display to see.
I could go on and on about the "beneficial" effect of US policy on many countries of the Earth.
Only developed countries, those who occupied by the United States during the Second World War, which developed well without the United States, doing more or less O.K.
It would be much better for all mankind if the USA stayed at home. But capitalism is expansion and seizures, military and economic. The bigger and stronger capitalist state, the more it is Evil Empire.