The Mexican American war contribute significantly to the debate about the legality of slavery and which states should permit the practice what legislation decided what to do with the acquisition in the treaty of Guadalupe Hidalgo? A. compromise of 1850
B. Missouri compromise
C. townshend acts
D. Dred Scott decision

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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.

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this is a good question! i'll do some research and come back when i have the answer!