In what year was the Constitution ratified?

The Constitution of the United States was ratified in 1788. This year is significant because it marks the completion of the process required for the Constitution to become the law of the land. After the Constitutional Convention in 1787, the proposed Constitution was submitted to the states for ratification, and by June 1788, enough states had approved it to fulfill the requirement for it to take effect.

While 1776 is remembered for the Declaration of Independence, and 1791 is notable for the ratification of the Bill of Rights, these dates do not pertain to the ratification of the Constitution itself. The year 1787 is also important, as that is when the Constitution was drafted, but ratification did not occur until the following year.