After the British defeat by American forces helped by the French, Great Britain recognized the independence of the United States and the states' sovereignty over American land west to the Mississippi River. A constitutional convention was organized in 1787 by those wishing to establish a stronger national government, with powers of taxation. The United States Constitution was approved in 1788, and the new republic's first Senate, House of Representatives, and President—George Washington—took office in 1789. The Bill of Rights, forbidding federal restriction of personal freedoms and certifying a range of legal protections, was adopted in 1791.