In the era c. 1450-c.1750, leaders in russia sought to expand eastward into siberia for which of these reasons

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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maryland and missouri