Which best describes why the relationship between the united states and china improved toward the end of the twentieth century?

lincoln presided over the union victory in the american civil war, which dominated his presidency. a former whig, lincoln ran on a political platform opposed to the expansion of slavery in the territories. his election served as the immediate impetus for the outbreak of the american civil war.

"a government in which power is divided between state and national levels". federalism is a system of government in which entities such and state and province, share power with the national government.