Answer:
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.
<span>Barack Obama defeated Hillary Clinton in the 2008 Democratic Party primaries. On June 7, 2008, Clinton issued a statement stating that she was suspending her campaign. After securing the nomination, Barack Obama went on to win the presidency by defeating John McCain in the national election.</span>
Ireland, due to the potato famine.
B. Allied forces began to take the offensive for the first time in the Pacific
The answer is B Jim crow laws