Final answer:
The Constitution was ratified on June 21, 1788, after intensive debates, following its creation on September 17, 1787. The process involved the formation of two parties—the Federalists and the Anti-Federalists—and concluded with the unanimous ratification by all thirteen states when Rhode Island ratified it on May 29, 1790.
Step-by-step explanation:
When was the Constitution ratified?
The Constitution of the United States was ratified on June 21, 1788. After its creation on September 17, 1787, the Constitution was submitted to the states for ratification and went into effect once nine states had ratified it. Delaware was the first state to ratify the Constitution on December 7, 1787. A significant milestone occurred when New Hampshire became the ninth state to ratify the Constitution in the summer of 1788, allowing the Constitution to officially take effect. As a part of the ratification process, two parties emerged: Federalists, who supported ratification, and Anti-Federalists, who opposed it. The debates and discussions surrounding ratification were intense, but eventually, all thirteen states ratified the Constitution with Rhode Island being the last on May 29, 1790.