The supreme court serves what important function in the us federal goverment

It has original jurisdiction over, and therefore the power to resolve, disputes between states.

Explanation:  It establishes legal precedents that are almost always followed by lower courts. Throughout the year, Supreme Court justices review cases that have been appealed to the Court. Essentially, it's role in ensuring that each branch of government, the President and Congress, recognizes the limits of its own power.

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explanation:

people who make a question that includes something that isn't a question should be banned