1. Why was there controversy about California's request to join the Union?
California wanted to be admitted as a slave state which would have upset the balance
of power between slave states and free states

California asked to be admitted as a free state but southern states wanted the
territory to be dividied into slave states

California had 80,000 people and other states were concerned that the state would be too powerful.

California was feared to be too powerful because of the gold discovered in the mining
region.

it is the dominance of   the spanish language and roman catholic region in mexico, french being the official language of several african countries, and the existence of a western-style government in south asian countries

they bring people together to achieve control of the government

basically choosinng what sets in   congress and presdicny this is to keepthe antion hole and so it can last because wiht out authority it wouldnt last a week

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