By a vote of 7 to 2, the Supreme Court ruled that Dred Scott was not a person with rights, just a piece of property. Furthermore, it nullified the Missouri Compromise by indicating that states did not have the right to regulate private property (i.e. slaves) regardless of whether it was northern or southern state.
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During the discussion, unanimous decisions came up. Here is a partial list:
Marbury v. Madison (1803) 4-0
Established the court's power to declare laws unconstitutional
McCullough v. Maryland (1819) 7-0
Established the federal government has "implied powers" over the states
Brown v. Board of Education (1954) 9-0
Declared that segregated schools were inherently unequal, compelled school integration
Gideon v. Wainwright (1963) 9-0
Criminal defendants have the right to an attorney even if they cannot afford one
New York v. Sullivan (1964) 9-0
Lawsuits based on libel must show intent or recklessness on the defendant's part
Loving v. Virginia (1967) 9-0
Invalidated state laws that prohibited interracial marriage
United States v. Nixon (1974) 8-0
Declared the president cannot use executive privilege to withhold evidence in a criminal trial