Following the Emancipation Proclamation, there were many economic and social changes which led to unrest. In what ways was this unrest apparent? What sorts of things were happening that showed that there was civil unrest?

so, based on the research i've done. the u.s. government were always on a wild goose chase just to take down castro. he then retired his trone to his brother raul in 2008 due to some health issues. so it's obvious your answer would be:

castro had no allies from which he could receive aid.

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i would think the answer is between b and d i would say d sorry if wrong