Which did henry steele commager identify as the “new loyalty” in america?

It is the Republicanism. Republicanism is a belief system of being a national in a state as a republic under which the general population hold prominent sway. Numerous nations are "republics" as in they are not governments. 
Republicanism is the controlling political reasoning of the United States. It has been a noteworthy piece of American city thought since its establishing. It was a lifestyle, a center belief system, an uncompromising sense of duty regarding freedom, and an aggregate dismissal of nobility."