The Missouri Compromise a. was an attempt to keep the number of slave and free states the same. b. marked the end of the war with Mexico. c. went largely unnoticed by the majority of politicians. d. lasted more than 50 years.

A. an attempt to keep the # of slave & free states the same

Explanation:

A. this is true because Missouri was a slave state, but fought to make states in the north free

B. this is incorrect because the Treaty of Guadalupe Hidalgo is what ended the American-Mexican War

C. it was quite the opposite for the Missouri Compromise

D. it lasted about 30 years.

the answer is longitudinal model

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