What is the purpose of state appellate courts?

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Explanation:

Appellate courts are the part of the judicial system that is responsible for hearing and reviewing appeals from legal cases that have already been heard in a trial-level or other lower court.

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in mcculloch v. maryland (1819) the supreme court ruled that congress had implied powers under the necessary and proper clause of article i, section 8 of the constitution to create the second bank of the united states and that the state of maryland lacked the power to tax the bank.

gibbons v. ogden, (1824), was a landmark decision in which the supreme court of the united states held that the power to regulate interstate commerce, granted to congress by the commerce clause of the united states constitution, encompassed the power to regulate navigation.