Which of the following was a weakness of the Articles of Confederation?
Congress could not suppress rebellion.

Congress could not declare war.

Congress could not regulate interstate trade.

Congress could not negotiate with Indian nations.

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

a.) it weakened the power of the catholic church in europe.