The document provides information about the structure and purpose of the US judicial system. It discusses that the Supreme Court interprets laws and their constitutionality, and is appointed by the President and approved by the Senate. Two influential Supreme Court cases were discussed - Dred Scott v Sandford which upheld slavery and Brown v Board of Education which outlawed public school segregation. The President and Senate provide checks on the Supreme Court through judicial appointments. Lower federal courts were established by Congress and state courts by state governments.