What effect did interstate highways have on suburban growth?
they made it easier for people to live in the suburbs.
they made it difficult for people to live in cities.
they made it difficult for people to work in cities.
they made it easier for people to work in the suburbs.

They made it easier for people to live in the suburbs.

Explanation:

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