Why did President Jackson believe nullification crisis would threaten the stability of the nation?

Andrew Jackson, generally in favor of states' rights, saw nullification as a threat to the Union. In his view, the federal government derived its power from the people, not from the states, and the federal laws had greater authority than those of the individual states.

Explanation:

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b.) It threatens the nations of Iran and Pakistan.

c.) It threatens the world’s oil supply.

Explanation:

option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

explanation:

he sent troops to protect the students as they entered the school.