On June 21, 1788, the Constitution became the official framework of the government of the United States of America when New Hampshire became the ninth of 13 states to ratify it. The journey to ratification, however, was a long and arduous process.

When was the Constitution ratified last?

May 29, 1790 Rhode Island is the last state to ratify the Constitution.

When was the Constitution written and ratified?

Written in 1787, the Constitution was signed on September 17. But it wasn't until 1788 that it was ratified by the necessary nine states.