What event occurred first Delaware is the first state to join the union Declaration of Independence Constitutional Convention of the?

Delaware became the first state to join the Union on December 7, 1787, ratifying the U.S. Constitution. This event occurred after the Declaration of Independence, which was adopted on July 4, 1776, and before the Constitutional Convention, which took place in 1787. Thus, the Declaration of Independence was the earliest of these significant historical events.