Delaware Ratifies the US Constitution and is the First State Admitted to the Union

Following the American Revolution, statesmen from Delaware were among the leading proponents of a strong central United States with equal representation for each state. Once the Connecticut Compromise was reached—creating a U.S. Senate and U.S. House of Representatives—the leaders in Delaware were able to easily secure ratification of the U.S. Constitution on December 7, 1787, making Delaware the first state to do so.

http://en.wikipedia.org/wiki/Delaware