Which of the following created a line that indicated which new states would be free or slave states? a. missouri compromise b. marbury v. madison c. american system d. monroe doctrine

The answer is option A.

Explanation:

With an end goal to save the equalization of intensity in Congress among slave and free expresses, the Missouri Compromise was passed in 1820 conceding Missouri as a slave state and Maine as a free state. In 1854, the Missouri Compromise was canceled by the Kansas-Nebraska Act. The reason for the Missouri Compromise was to keep a harmony between the quantity of slave states and the quantity of free states in the Union. It enabled Missouri to enter as a slave state in the meantime Maine entered as a free state, along these lines keeping up a parity in quantities of free and slave states.

to protect the united states' role as a world leader, president truman wanted to prevent the soviet union from spreading communism beyond its post-world war ii boundaries. he declared that the united states must assist any nations struggling to prevent a communist takeover.