Why hasn't the U.S. attempted to establish relatively peaceful relations with Cuba, especially in recent history?

Posted by 98Saman@reddit | AskAnAmerican | View on Reddit | 115 comments

Why does the U.S. continue to impose an embargo on a relatively weak and poor country facing numerous challenges, especially when communism is widely unpopular what the fear of spreading Soviet style regimes is so low these days? The sanctions seem to harm ordinary citizens more than the government. Moreover, why is Cuba treated as the primary enemy, while the U.S. maintains favorable relations with other socialist or authoritarian regimes?