In Marbury, the Supreme Courttook the power to declare that laws passed by Congress were null and void if they (in the Court'sopinion) violated the Constitution. The significance of Marbury v.Madison is that the ruling in thatcase gave the Supreme Court of the United States the power of judicial review.
2) the treaty of Guadalupe Hidalgo lead to mexico giving the United States 525,000 square miles of territory, including the land that makes up arizona, california, colorado, new mexico, nevada, utah and wyoming