Congress' powers refer to the constitutional authorities granted to the legislative branch of the United States government, which consists of the House of Representatives and the Senate. These powers, outlined primarily in Article I of the Constitution, include the ability to make laws, levy taxes, regulate commerce, declare war, and maintain an army and navy. The ratification of the U.S. Constitution was crucial as it established a stronger federal government with clear delineation of these powers, addressing the weaknesses of the Articles of Confederation.