What was the nullifistion crisis

The nullification crisis was a conflict between the U.S. state of South Carolina and the federal government of the United States in 1832–33. ... Calhoun, who opposed the federal imposition of the tariffs of 1828 and 1832 and argued that the U.S. Constitution gave states the right to block the enforcement of a federal law.

The nullification was a confrontation between South Carolina and the government in 1832

i believe it was spain

impeachment is when a president is committing treason or doing shading acts while in presidendcy therfor he can be impeached   by congress