Cotton production increased. 4. Before the invention of the cotton gin, what
did many American leaders think would happen
to slavery?

The cotton gin made the cotton industry of the South explode. Before its invention, separating cotton fibers from its seeds was a labor-intensive and unprofitable venture. After Whitney unveiled his cotton gin, processing cotton became much easier, resulting in greater availability and cheaper cloth.

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:

billygate was not one of the scandals