Conversation so far:
What are the most important US supreme court cases?
Marbury v. Madison, 1803 (4-0 decision) ...McCulloch v. Maryland, 1819 (7-0 decision) ...Dred Scott v. Sandford, 1857 (7-2 decision) ...Plessy v. Ferguson, 1896 (7-1 decision) ...Korematsu v. United States,
What did Plessy v. Ferguson establish?
Plessy v. Ferguson was a landmark 1896 U.S. Supreme Court decision that upheld the constitutionality of racial segregation under the “separate but equal” doctrine. The case stemmed from an 1892 incident in which African-American train passenger Homer Plessy refused to sit in a car for blacks.
What did the Marbury vs Madison case establish?
The U.S. Supreme Court case Marbury v. Madison (1803) established the principle of judicial review—the power of the federal courts to declare legislative and executive acts unconstitutional. The unanimous opinion was written by Chief Justice John Marshall.

Question: Was it unanimous?
Self-contained rewrite: Was the Marbury vs Madison case unanimous?