What did the Missouri Compromise primarily accomplish in the Senate?

• A. Maintained balance of Free and Slave states in the Senate
• B. Created a system of federal funds for infrastructure
• C. Ended the practice of slavery in the United States
• D. Established the principle of citizens voting directly for senators

Answer: (A)

The main idea being tested is how Senate balance between free and slave states was preserved. In the Senate, each state has two senators, so admitting a new slave state without a counterbalance could tilt power toward the pro-slavery side. The Missouri Compromise addressed this by admitting Missouri as a slave state and Maine as a free state, keeping the overall number of free and slave states equal in the Senate. This ensured that neither side gained an advantage in legislative votes, at least for the time being. It also introduced the 36°30′ line as a future guideline for where slavery would be allowed in new territories, but the essential Senate impact was maintaining that balance.

The other options don’t fit because the plan was not about funding infrastructure, it did not end slavery nationwide, and it did not change how senators were chosen by voters (that later changed with the 17th Amendment).