Keynes refers to the Great Depression when he sings “BOOM, 1929 the big crash…” How does he use this historical event to support his theory of government interventionism?

sumerians were responsible.

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:

answer: sorry but maybe take a pic of the map so nobody's confused

explanation: