Final answer:
The Philadelphia Convention of 1787 was the event where delegates, originally meant to revise the Articles of Confederation, instead created the new United States Constitution.
Step-by-step explanation:
The Philadelphia Convention, also known as the Constitutional Convention of 1787, was initially convened with the intent to revise the Articles of Confederation. However, the delegates soon recognized that fundamental changes were necessary and opted to draft an entirely new framework for the United States government. Despite the original intention to amend the Articles, the outcome was the creation of a new Constitution.
Among the leaders of this monumental event were James Madison and Alexander Hamilton, key proponents of a stronger federal government. The convention was marked by significant debate over state sovereignty and the balance of power. Finally, after extensive discussions and compromises, the delegates presented the new Constitution on September 17, 1787, which provided a solid foundation for the nascent nation and replaced the ineffective Articles of Confederation.