The missouri compromise included a provision that said most of the territory from the would remain free.

a) oklahoma territory

b) alaskan territory

c) louisiana purchase

d) yukon

i think it is a system for harvesting crops more easily

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:

they are best described as reliable search engines.

your stuuupid lolz

explanation: