In the Scott v. Sandford case, why was the argument of Sandford’s widow based on the fifth amendment?

What are the three ways that a republican state chairman can become a member of his party's national committee?

The slave dred scott sued for his freedom because he was born a free man. he had lived in a free state. slavery violated the 13th amendment he had been freed by pres. lincoln.

Why did some states believe they had the power to overturn federal laws?