The so-called "triangle trade" saw a huge increase in the exchange of food, goods, wealth and even people as slaves. this appeared in the 1500s between africa, europe and the western hemisphere. the one item that was also part of this massive exchange was involuntary and not sought after by the traders or colonial powers. this item was

the spanish  

hope this meaning spain btw

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.

hope this and have a fantastic day!

                                                    -wolfiewolffromsketch