What was one way that northern rebels tried to get southerners to join their cause before the Revolutionary War? Select the best answer from the choices provided.
A.
They attempted to expand the plantation system in the North.
B.
They suppressed the issue of slavery and abolition at the time.
C.
They sent enslaved African Americans as gifts to major southern plantation enslavers.
D.
All answers are correct.

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:

i would go with the last one