Augustus Caesar contributed to the Roman Empire by: giving power back to the Senate and tribunes.
ruling as Rome's first emperor during the pax Romana
ordering the empire to expand to its largest size
dividing Roman citizens into plebeians and patricians.

ruling as rome's first emperor during the pax Romana

Explanation:

federal appellate courts are called courts of appeals. cases can be further appealed to the u.s. supreme court. cases are heard for the first time in a trial court. if either party disagrees with the decision in the trial court, they can appeal, asking a higher court to review the decision.

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the constitution gives congress the power to regulate commerce "among" the several states.