What governmental principle of the united states is based on montesquieu's concerns

Many credit Montesquieu with the development of the doctrine of separation of powers.

Montesquieu was concerned with the conflation of powers, wherein the legislature could also try and the judges could make law.

united states reinforcements contributed greatly to three allied victories in france at: cantigny (first major american battle), argonne (the largest in the united states military history, involving 1.2 million american soldiers), and château-thierry (one of the first actions under general pershing).