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. This convention, held in Philadelphia in 1787, brought together delegates from various states to address the weaknesses of the Articles of Confederation and create a stronger framework for the federal government. The outcome of this meeting was the drafting of the U.S. Constitution, which established the structure of the government, outlining the separation of powers among the legislative, executive, and judicial branches and enumerating the rights of citizens.

The other options reflect important aspects of American history but did not occur at the Constitutional Convention itself. The Bill of Rights was ratified later, in 1791, as the first ten amendments to the Constitution, designed to protect individual freedoms. The Declaration of Independence was created earlier, in 1776, declaring the thirteen American colonies' independence from British rule. Lastly, the election of the first President, George Washington, occurred in 1789, after the Constitution was already in place. Thus, the writing of the Constitution is the central achievement of the Constitutional Convention.