1.

What did the Missouri Compromise accomplish?

It kept the number of free states and slave states equal by bringing in MIssouri and California into the Union.

It stated that land acquired in the Louisiana Purchase would have the right to decide whether or not they wanted slavery.

It kept the number of free states and slave states equal by bringing in Missouri and Maine into the Union.

It regarded all territory gained in the Mexican Cession as free land

The correct answer is: It kept the number of free states and slave states equal by bringing in Missouri and Maine into the Union.

The correct answer is: It kept the number of free states and slave states equal by bringing in Missouri and Maine into the Union.

To arrive at this answer, we examine the options provided and eliminate the ones that don't match what the Missouri Compromise accomplished.

Option 1 is incorrect because the Missouri Compromise did not bring in California, as it did not exist as a state at the time.

Option 2 is partially correct, as the Missouri Compromise did address the issue of whether new territories would allow slavery. However, it specifically applied to the land acquired in the Louisiana Purchase, not all territories gained later on.

Option 3 is the correct answer. The Missouri Compromise admitted Missouri as a slave state and Maine as a free state, thus maintaining the balance between free and slave states in the Union.

Option 4 is incorrect because the Missouri Compromise did not apply to the Mexican Cession, which was obtained after the Missouri Compromise was established.

It's important to carefully read each option and consider which one aligns with the historical context and facts of the Missouri Compromise.

The correct answer is:

It kept the number of free states and slave states equal by bringing in Missouri and Maine into the Union.