In the South, many enslaved African Americans supported the Union by . providing military information to Union armies

deliberately working faster to increase production

revolting against plantation owners

refusing to fight in the Confederate army

answer: idk

explanation: because i just don't

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:

wisdom

explanation:

the fact that that the teachings on the cosmic order comes from, or through, the heart center

you didn't list the options. however, a few communist countries today are: the people's republic of china, north korea, and cuba.