What significant event took place at the Constitutional Convention?

The significant event that took place at the Constitutional Convention was the writing of the Constitution. Held in 1787 in Philadelphia, the convention aimed to address the inadequacies of the Articles of Confederation and to create a robust framework for a central government. Delegates from the thirteen original states gathered to draft a new governing document, which would ultimately lay the foundation for the United States government as we know it today. This resulted in the creation of a balanced system of governance that separated powers among different branches and incorporated checks and balances.

The other options refer to key historical events but did not occur at the Constitutional Convention. The signing of the Declaration of Independence, for example, happened in 1776, establishing the colonies' independence from Britain. The establishment of the Bill of Rights took place later when the first ten amendments to the Constitution were ratified in 1791. The election of the first President, George Washington, followed after the Constitution was ratified and thus cannot be linked to the work done at the Constitutional Convention.