<Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> Article One of the United States Constitution establishes the legislative branch of the federal government, the United States Congress . The Congress is a bicameral legislature consisting of a House of Representatives and a Senate . </P> <P> All legislative Powers herein granted shall be vested in a Congress of the United States, which shall consist of a Senate and House of Representatives . </P>

What is the purpose of article 1 of the constitution