In the United States, the legislative branch is Congress, a bicameral body made up of the House of Representatives and the Senate. Article I of the Constitution vests federal lawmaking power in Congress. The House has 435 voting members apportioned by state population and elected to two-year terms; the Senate has 100 members—two from each state—elected to six-year terms.
Only the House may originate revenue bills, while the Senate uniquely confirms many presidential nominations and ratifies treaties. Both chambers must agree to the same bill in the same form before it can go to the President. House.gov notes that the House’s voting size has been fixed at 435 since the early 20th century under federal law.