What part of the federal government writes laws?

Why this is the answer

Congress, the legislative branch, writes federal laws. A proposed law is called a bill. It has to pass both the House of Representatives and the Senate by majority vote, and then it goes to the President, who signs it into law or vetoes it. The Founders described Congress in the very first article of the Constitution because they considered the power to make laws the most important power in government. Any of the three official names is accepted: Congress, the legislature or the legislative branch. Memory hook: to legislate is to make laws.