The middle colonies’ need for a growing labor force was largely filled by
a.
skilled laborers.
c.
indentured servants.
b.
slaves and free african americans.
d.
apprentices.

four sitting presidents have been assassinated while in office but the first was abraham lincoln,

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

the correct answer is d- trough trades

i did a test and got it right

hope it ! : )