The Constitutional Convention took place from May 25 to September 17, 1787, in Philadelphia, Pennsylvania. The intention of many of its proponents, chief among them James Madison and Alexander Hamilton, was to create a new government rather than fix the existing one. The delegates elected George Washington to preside over the Convention. The result of the Convention was the creation of the United States Constitution, placing the Convention among the most significant events in the history of the United States. The Constitutional Convention created a new, unprecedented form of government by reallocating powers of government. Every previous national authority had been either a centralized government, or a "confederation of sovereign constituent states." The American power-sharing was unique at the time. The sources and changes of power were up to the states. The foundations of government and extent of power came from both national and state sources. But the new government would have a national operation.