Revolutions from “below” are organized by peoplepolitical

People

Explanation:

When we say that a revolution came "from below," what we mean is that this was organized by the common people of a place. The word "below" refers to the fact that common people tend to be at the bottom of the social hierarchy. In fact, this can often be the reason for the revolution itself. Many of the world's most famous and successful revolutions were in fact organized from below.

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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                                                    -wolfiewolffromsketch