This was 62 years ago, if just the crisis was the reason, it would be gone long ago, at least since 1991. No, the true reason is that thriving socialist state in a beret toss distance from USA would undermine US imperialism greatly. Remember that entire capitalism hinges on the propaganda that “socialism don’t work”, and while it demostrably do work, it’s always some far away so it can be propagandized and demonised to hell and back, so when they got one right beside them, they must sabotage it with all strenght.