As a result of the Missouri Compromise:

A. Slavery was prohibited in lands north of the Ohio River.
B. The North gained control of the House of Representatives.
C. A boundary line was established for further expansion of slavery.
D. Missouri abolished slavery before gaining admission to the Union.
E. Slavery spread throughout the Union.

The Missouri Compromise was a pivotal legislative decision that resulted in Maine becoming a Free State while Missouri entered as a Slave State, with a defined boundary for the prohibition of slavery.

Explanation:

The Missouri Compromise of 1820 was a legislative measure passed to maintain a balance between Free States and Slave States in the United States. It allowed Maine to enter as a Free State while admitting Missouri as a Slave State, with the boundary at 36°30' prohibiting slavery north of it in the territories of the Louisiana Purchase.

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