When was the first U. S. state constitution adopted?

A. 1760

B. 1776

C. 1787

D. 1800

C is the answer Delaware was the first state to ratify, on December 7, 1787. After New Hampshire became the ninth state to ratify, on June 22, 1788, the Confederation Congress established March 9, 1789, as the date to begin operating under the Constitution.