How did alexander palmer justify the palmer raids of 1919 and 1920? palmer supported taking radical action against conservatives. palmer claimed to be the leader of the communist party. palmer claimed that the espionage and sedition acts were unconstitutional. palmer warned of an imminent communist takeover.

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:

b. native americans them