The decision codified slavery and stated that slaves were not citizens, but property. These things made it important and set the stage for the civil war.
Dred Scot decision in 1855 by the Supreme Court.
The US Supreme Court made a decision in the case of Gibbons v. Ogden, (1824). See Related Questions, below, for a discussion of that decision.
In most cases a Supreme Court decision is permanent. The current Supreme Court can change the decision of a previous Supreme Court.
It allowed the Supreme Court to overrule an unconstitutional law.
The United States Supreme Court decision in the DDred Scott v. Sandford (1857 was important because it helped strengthen the determination of abolitionists to realize their goals.
In the move Separate but Equal it was very important that the Supreme Court vote was unanimous to support the change to society. The decision was going to bring about social change and the decision need to come from a united front.
Generally speaking, on the US Supreme Court, the deciding vote in an ideological decision is Justice ANTHONY KENNEDY.
It established the authority of the Supreme Court to rule on the constitutionality of an act of Congress. That is, it resolved that the Supreme Court is the final authority when determining whether a law is Constitutional or not.
The supreme's court overturned Miranda conviction in a 5 to 4 decision.
Since you didn't say WHICH Supreme Court decision, there is no way to answer the question.
No it can't. The only way to overturn a supreme court decision is either another supreme court decision, or a constitutional amendment.
It established the authority of the Supreme Court to rule on the constitutionality of an act of Congress. That is, it resolved that the Supreme Court is the final authority when determining whether a law is Constitutional or not.