Why doesnt the USA invade Cuba now?

There is no threat from Cuba to have the US invade them. The cold war was a weak attempt to invade Cuba to begin with. We invaded and failed (Bay of Pigs) because Castro wanted communism(and took over American business and investments when he took office that were in Cuba). With all the international rules and treaties, America wouldn't have the right to invade Cuba. Same thing with Vietnam, it was proven the whole reason US invaded Vietnam (sinking of a battle cruiser) was completely staged. US should have never engaged and to go again would cause a m public outrage. Hope this helps.