Ask your friend for proof that the US was involved. There was a coup attempt (about two years ago) where the venezuelan opposition captured Chavez, but then caved in to international pressure and freed him. It's really too bad they didn't just kill him. It would have saved Venezuela a lot of suffering. Chavez, trying to play the anti-USA sympathy card, said it must have been the United States who orchestrated it. He never showed any proof, of course.
It is internationally recognized that Chavez is a pathological liar.
Ironically, Chavez himself led a failed coup attempt back around 1992 or 1993. Ask your friend if the USA orchestrated that one too.
Simple answer is:
Venezuela is so corrupt it could have made Al Capone jealous. Coup attempts, assasinations, extortion, embezzling, etc are as much a part of Venezuelan culture as coffee and beer.