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The legislative branch - the Congress - is made up of elected representatives from each of the 50 states. It is the only branch of U.S. government that can make federal laws, levy federal taxes, declare war, and put foreign treaties into effect.

Members of the House of Representatives are elected to two-year terms. Each member represents a district in his or her home state. The number of districts is determined by a census, which is conducted every 10 years. The most populous states are allowed more representatives than the smaller ones, some of which have only one. In all, there are 435 representatives in the House.

Senators are elected to six-year terms. Each state has two senators, regardless of population. Senators' terms are staggered, so that one-third of the Senate stands for election every two years. There are 100 senators.

To become a law, a bill must pass both the House and the Senate. After the bill is introduced in either body, it is studied by one or more committees, amended, voted out of committee, and discussed in the chamber of the House or Senate. If passed by one body, it goes to the other for consideration. When a bill passes the House and the Senate in different forms, members of both bodies meet in a "conference committee" to iron out the differences. Groups that try to persuade members of Congress to vote for or against a bill are called "lobbies." They may try to exert their influence at almost any stage of the legislative process. Once both bodies have passed the same version of a bill, it goes to the president for approval.

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