What Supreme Court decision in effect meant that the Constitution protected slavery?

1: Election of 1856
2: Dred Scott case
3: Compromise of 1850
4: Missouri Compromise
I am picking # 4 is this correct?

I think I should change my answer to # 2 is this correct? It was decided Dred Scott was not free and Missouri Compromise protected slavery.

Were the Missouri Compromise, the Compromise of 1850, or ANY (except 2000) elections Supreme Court decisions?

You are right, the answer is #2, but you should know that that is the ONLY Supreme Court decision among the choices.

Yep

No, the correct answer is option 2: Dred Scott case. The Supreme Court decision in the Dred Scott v. Sandford case, handed down in 1857, effectively meant that the Constitution protected slavery. In this case, the Court ruled that African Americans, whether free or enslaved, were not considered citizens and therefore had no rights or protections under the Constitution. The decision also declared the Missouri Compromise of 1820, which prohibited slavery in certain territories, to be unconstitutional. As a result, this decision further entrenched and protected the institution of slavery in the United States.