Which of the following is true of the economy of the 1970s? o The Rust Belt declined economically, while the Sun Belt grew
o There was an increase in manufacturing jobs during the decade
O The Sun Belt declined economically, while the Rust Belt grew

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:

what are the options ?

d. dr. francis collins