Answer:
1. The decision in Marbury v Madison established the practice of judicial review.
2. Marshall wrote the supreme court decision that established the principle of judicial review.
3. The Supreme Court first stated that the courts may declare a federal law unconstitutional.
4. The Supreme Court established a principle that would eventually be used by all courts to strike down any law the court deems unconstitutional.
Step-by-step explanation:
All of these answers can be confirmed by looking up the significance of Marbury v Madison.