I am a word for a nation where the laws are created by representative who are elected by the people

a.

congress passed laws allowing for free passage between states.

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.

you didn't list the options. however, a few communist countries today are: the people's republic of china, north korea, and cuba.