United States Army
Also known as: U.S. Army · USAR · American Army · Ground forces of the United States Armed Forces · US land forces · US troop · US troops · U. S. Army
The United States Army is the land service branch of the United States Armed Forces.
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provided protection and infrastructure for trail travelers
The Army established forts along the major trails to provide supply depots, protection from conflict, and assistance to settlers during the migration period.