What was the main outcome of the Marbury v. Madison case?

The main outcome of the Marbury v. Madison case was the establishment of the principle of judicial review. This landmark decision, issued by the Supreme Court in 1803, affirmed the Court's authority to review acts of Congress and determine their constitutionality. This means that the judiciary has the power to invalidate laws and government actions that are found to contravene the Constitution.

This principle is critical because it solidifies the role of the judicial branch as a check on the legislative and executive branches, ensuring that all laws comply with the Constitution. Judicial review was not explicitly outlined in the Constitution, but the Marbury v. Madison ruling provided a foundational precedent for the judiciary's role in maintaining constitutional governance.

Other options presented do not accurately reflect the case's significance. The concept of federalism relates to the distribution of power between national and state governments, which was not the focus of the Marbury v. Madison ruling. Similarly, declaring a state law unconstitutional pertains to issues of state versus federal authority, which was not the case's primary outcome. Strengthening the power of Congress is also not relevant, as the case primarily aimed to establish the judiciary’s power to check Congress and ensure its actions adhered to constitutional standards.