It's a one party system because they got rid of all the other parties and they get full rain of the country and get to do whatever they want. Also fascists believe that great nations show their greatness by conquering and ruling other weak nations. Fascists think the state can survive only if it successfully proves its military superiority in war.
Marbury v. Madison is essential because it established the power of judicial review for the U.S. Supreme Court and lower federal courts concerning the Constitution and eventually for parallel state courts for state constitutions.
Veto power. Once Congress has passed a bill, the president has the power to veto that bill. In turn, Congress can override a regular presidential veto by a two-thirds vote of both houses.