What is the role of the US Supreme Court?

The primary role of the US Supreme Court is to make final determinations on the constitutionality of laws. This involves interpreting the Constitution and assessing whether federal and state legislation aligns with its principles. When cases involving significant constitutional questions arise, the Supreme Court has the authority to review decisions made by lower courts, ensuring that all laws comply with constitutional standards. This function is crucial for maintaining the rule of law and protecting individual rights against potential legislative overreach.

In this context, the other choices represent roles that do not align with the core functions of the Supreme Court. For instance, the Court does not oversee local court decisions directly, nor is it responsible for creating new laws or enforcing existing ones—these responsibilities lie with the legislative and executive branches of government. The Supreme Court's focus is solely on judicial review and interpretation, and its decisions set binding precedents for all lower courts in the United States.