As per the Constitution of America:
The American Congress is the bicameral legislative body. The Congress consists of Senate (Upper House) and House of Representatives (Lower House). The House of Representatives consists of 435 elected representatives that are divided among the 50 states in proportion to their total population. The number of 435 members representing each state is determined by the population with every state guaranteed at least one seat. These representatives represent the interest, concerns and requirements of the people from their constituency.
The House of Representatives requires one to be at least twenty-five years old and a U.S. citizen for at least 7 years and must be resident of the state from which the representative is elected. The members of the House of Representatives are elected every two years. The House is presided over by the Speaker whom the House itself chooses.