What is a reason that the Missouri Compromise did not have lasting effects?

That's the first question.
Here are the answers for the quiz 1-9. 10 you gotta do yourself.
1. it only applied to the lands of louisiana purchase

2. Wilmot Proviso

3. They began to view it as a moral problem

4. it reopened debate over the border between free and slave states

5. Wilmot Proviso

6. Naval blockade and seizing control of the mississippi river

7. an enslaved family is being sold at an auction

8. his cautious nature on the battlefield

9. it made slavery legal in the territories.

I can 100% guarantee these are correct. I just took the quiz and here are the correct answers.

2 answers

10. The Kansas-Nebraska Act
that has nothing to do with this quiz-