6 is D that’s super easy learned it before
Answer:
Explanation:
1. Louisiana Purchase by Thomas Jefferson-opened a large territory for the U.S.
2.The Missouri Compromise by Henry Clay which divided the U.S. into free and slave states
3. The Kansas Nebraska Act created by Stephen A. Douglas which allowed the states to decide if they want to be free or slave states(AKA: popular sovereignty)
The simple answer here is because of slavery.
the answer is A the temperance movement