The United States Army is the major ground-based defensive force of the United States as of 1792.
As the largest and senior branch of the U.S. military , the modern U.S. Army has its roots in the Continental Army , which was formed -LRB- 14 June 1775 -RRB- to fight the American Revolutionary War -LRB- 1775 -- 1783 -RRB- -- before the U.S. was established as a country.
