What significant event took place at the Constitutional Convention?

The significant event that took place at the Constitutional Convention was the drafting of the Constitution. This convention, held in Philadelphia in 1787, brought together delegates from various states to address the weaknesses of the Articles of Confederation and to create a more robust framework for the federal government. Through a series of debates and compromises, the delegates produced a new Constitution that established the structure of government, defined the separation of powers, and included the principles of federalism and checks and balances. This document became the foundation of the United States government and has been in effect since its ratification.

The other options relate to important historical events, but they did not occur during the Constitutional Convention. The Bill of Rights was introduced after the Constitution was drafted, aiming to protect individual liberties. The rise of political parties began to take shape after the Constitution was ratified, as political factions developed around differing interpretations and implementations of the new government. The Declaration of Independence was created in 1776, well before the Constitutional Convention, marking the colonies' separation from British rule and not the formation of the government as defined by the Constitution.