The Constitutional Convention was a meeting that took place in Philadelphia from May 25 to September 17, 1787, with the intention of revising the league of states and first system of government under the Articles of Confederation). However, many of the proponents, including James Madison and Alexander Hamilton, intended to create a new Frame of Government rather than fix the existing one). The delegates elected George Washington to become President of the convention, and the result of the convention was the creation of the Constitution of the United States, which established a federal government with more specific powers, including those related to conducting relations with foreign governments.

During the convention, the delegates debated for months over what would be included in the Constitution. Some states were in favor of a strong central government, while other states were opposed. Large states felt that they should have more representation in Congress, while small states wanted equal representation with larger ones. The delegates finally agreed to the "Great Compromise," which is also known as the Connecticut Compromise. The Constitution also created an executive branch and a judicial branch, which set up a system of checks and balances.

The Constitutional Convention was a significant event in American history, as it produced the first written constitution for any nation in the history of the world. After the necessary number of state ratifications, the Constitution came into effect in 1789 and has served as the basis of the United States Government ever since.