Who developed the Virginia plan, which provides the basic framework and central ideas of the US constitution

James Madison drafted the Virginia Plan, and was proposed by Virginia delegates.

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