How long did the great depression last?

Im not quite sure why that other answer has one star. It is actually correct. The great depression began in 1929. What you were probably looking for the answer to Edgenunity. In this case, the answer would be "until World War II" and World War 2 is commonly known to have started in 1939. Hope this helps someone else seeing as this was posted in 2016 lol.

Explanation:

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:

to act quickly in times of danger to the united states

because you have to act quickly if you want to live/survive.