Yes they can, and they have. Some have been declared unconstitutional by the Supreme Court after being passed. In general, federal law supersedes state law.
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the congress may veto laws or pass laws for a city.
With the consent of Congress, states can do many things. They can enter a treaty, engage in war, and have duties on imports.
To write and pass new laws for the country
No. Article I, Section 9, paragraph 3 of the Constitution prohibits Congress from passing ex post facto laws.
The section in the constitution that gives congress the power to pass laws nessary and proper to fulfill its other duties is the? Elastic Clause