Why did slavery survive in the new united states

slavery was dying out in the south until the cotton gin was invented. Suddenly there was allot of money to be made from cotton but people were needed to pick the cotton and then separate the fibers on the cotton gin so it grow in popularity again.

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: