Legislative Branch. According to Article I of the Constitution, the legislative branch (the U.S. Congress) has the primary power to make the country's laws. This legislative power is divided further into the two chambers, or houses, of Congress: the House of Representatives and the Senate. Hope I helped!
To sell the war to the nation, the government raised taxes. It raised ⅓ of the war effort from raising taxes with progressive income, war profit tax, tobacco, liquor, and luxurious goods. They also had thousands of people asking for money and guilted them if they didn't give them any by saying only "a friend of Germany" wouldn't help.