The Congress of the United States is the legislative branch of the federal government of the United States. It is bicameral, comprising the House of Representatives and the Senate. The House consists of 435 members, each of whom represents a congressional district and serves for a two-year term. Seats in the House are apportioned among the states on the basis of population; by contrast, each state is represented in the Senate by two members, regardless of population. There are a total of 100 Senators, who serve six-year terms. The United States Constitution vests all the legislative powers of the federal government in the Congress. The powers of Congress are limited to those expressly enumerated in the Constitution; all other powers are reserved to the states and the people, except where the Constitution provides otherwise. Significant powers of Congress include the authority to regulate interstate and foreign commerce, to levy taxes, to establish federal courts inferior to the Supreme Court, and to declare war. The Senate is fully equal to the House of Representatives, and not a mere "chamber of review," as is the case with the upper houses of the bicameral legislatures of many other nations.
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