research suggests that immigrants are better at learning english as a second language if they start before puberty. this finding aligns with the theory of language development, proposed by noted linguist noam chomsky.

sectionalism continues to divide the nation as the question of slavery being allowed in the mexican cession became a problem. -the results of the mexican war spark secession in the south because the north did not want to allow slavery in the territories won.

answer; ///i believe the correct answer is (c)///unify chinaplz check first