Did the US help put fidel Castro into power?

No, just the opposite. The US tried to prevent Castro from defeating Batista, because Batista was friendly toward the US and Castro was a Communist. The US never wanted Castro to take over and this can be seen by the later "Bay of Pigs" invasion that the US sponsored but failed to back up. There are accounts that the US through the CIA planned some elaborate schemes to kill Castro after he took over.