The laws are made in both the House of Representatives and the Senate. A bill (or law proposal) first goes to the House of Representatives. If passed there it moves on to the Senate. If it passes in the Senate, then the President of the United States has the power to say yes or say no to the new law.
The legislative branch of government, or legislature, has the power to make laws. Legislatures can be made up of one or more chambers. The United States government has a bicameral legislature. You can learn more about legislatures at http://en.wikipedia.org/wiki/Legislature.
The Legislative Branch of government is responsible for making laws. It consists of the Senate and the House of Representatives which forms the U.S. Congress. The House has the power to impeach federal officials including the President and can initiate revenue bills.