In a democracy a constitution draws its power from what

The correct answer is the people, that in a democracy the constitution derives its power from the people.

The constitution of the United States announced that the power to the government comes from the people of the United States. Democracy in the United States is present in the form of representational democracy (where citizens elect their delegates to run the administration) and not in the form of direct democracy (where rules and other decisions are performed predominantly by the majority of votes.

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.