What is the significance of the date September 17, 1787?

U.S. Constitution. On September 17, 1787, members of the Constitutional Convention signed the final draft of the Constitution. ... This motion, supported by George Mason and Elbridge Gerry, was voted down and the Constitution was adopted.

Explanation:

the foundation of greek city-states: following the fall of the mycenaean civilization in the 10th century bc, the area surrounding the empire went through its own mini dark ages. answer and explanation

the award is named for an american naval historian and theorist, rear admiral alfred thayer mahan, united states navy who, through his writing, provided stimulus and guidance to those who share in the defense of the nation.