<Tr> <Th_colspan="2"> Constitution </Th> </Tr> <Tr> <Td_colspan="2"> United States Constitution </Td> </Tr> <P> The United States Senate is the upper chamber of the United States Congress, which along with the United States House of Representatives--the lower chamber--comprises the legislature of the United States . </P> <P> The composition and powers of the Senate are established by Article One of the United States Constitution . The Senate is composed of senators, each of whom represents a single state in its entirety, with each state being equally represented by two senators, regardless of its population, serving staggered terms of six years; with 50 states currently in the Union, there are 100 U.S. Senators . From 1789 until 1913, Senators were appointed by legislatures of the states they represented; following the ratification of the Seventeenth Amendment in 1913, they are now popularly elected . The Senate chamber is located in the north wing of the Capitol, in Washington, D.C. </P>

The united states senate represents which branch of government