Our US Constitution is a c _ _ _ _ _ _ _ between .

Our US Constitution is a c _ o_ n_ t_ r_a _c _t between _the government of the United Statesand the people of the United States_(citizens).

Explanation:

The US Constitution was first drafted in 1789 by the Philadelphia convention representing 13 states.  It established the ground rules for the government of the United States, aware that absolute power corrupts absolutely, given the bad blood created by the then King of Great Britain when he exercised maximum powers over his kingdom, including the then US colonies.  It, therefore, built-in checks and balances between the powers of the three arms of government.

The constitution has seven articles and specifies governmental authority, processes, and procedures.  It safeguards liberty, justice, and civil rights.  It became effective on March 4, 1789.  It has been amended 27 times.

they wanted the u.s. to fight on the side of the central powers.