The process of preparing the us army and people for world war 1 was called

Mobilization, is the right answer.

Explanation:

Throughout World War I, mobilization was succeeded by  giving focus on three phenomena:

The collection of war equipment.

The mobilization of workforce and troops.

The formation of federal bureaus.

This means was certainly inevitable because it was the way the nation became combat-ready to face the war situation and also to secure their attempts will work.