Who signed the U.S. Constitution and when?

The U.S. Constitution was signed by thirty-nine delegates on September 17, 1787. This date is significant because it marks the conclusion of the Constitutional Convention, where the framework of the government was drafted to replace the Articles of Confederation. The thirty-nine delegates, representing various states, agreed on this document after extensive debate and compromise, embodying the principles of federalism and separation of powers intended to create a stronger national government.

The signing occurred in Philadelphia, Pennsylvania, and was a pivotal moment in American history, setting the foundation for the Constitution to be ratified by the states. This event is celebrated annually as Constitution Day, highlighting its importance in the development of the United States as a constitutional republic.

The other options provide incorrect dates or facts. The Declaration of Independence was signed on July 4, 1776, and some of the other dates mentioned pertain to events unrelated to the signing of the Constitution. January 1, 1789, marks the beginning of the new government under the Constitution, while April 12, 1785, is not a relevant date in this context at all. Thus, option B stands out as the accurate choice.