Which plan was now going to be used to bring the south back into the United States of America?

is it this?

Explanation:President Lincoln's Ten Percent Plan was intended to quickly readmit Southern states back into the Union without malice. As long as 10% of a state's voters swore an oath of allegiance to the United States, they could form a new government.

when arthor pulls out the sword

explanation:

becase he becomes !

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