To defend the US from it's enemies.
The Continental Army.
The revolution and indian wars
"There was no organization called the US Continental Army because the United States hadn't been formed when the Continental Army was assembled." Optionally: "George Washington was a General in the Continental Army."
who was the President who formed the army
Neither you or the army can a "birthday year". You can have a birthday or birth date or you can a birth year. The British Army seemed to be formed in 1661, though volunteer soldiers existed before that. The US Army was supposed formed in 1775.
"The Territorial Army of the UK was formed in 1908, while the same army in India was formed by the british in 1917."
For the US Civil War; most likely the commander in chief; Lincoln.
The Irish Republie Army were formed in 1919 - 1922
The modern Army has its roots in the Continental Congress which was formed on 14 June 1775 The Congress of the Confederation officially created the United States Army on 3 June 1784
The modern Army has its roots in the Continental Army which was formed on June 14, 1775, before the establishment of the United States, to meet the demands of the American Revolutinary War. Congress created the United States Army on June 14, 1784 after the end of the war to replace the disbanded Continental Army. The Army considers itself to be descended from the Continental Army and thus dates its inception from the origins of that force.
The US Army, like the US Department of Defense, is supported by the tax payer. The US Army Corp of Engineers is part of the US Army; just like the US Army Artillery, or US Army Armor, or US Army Infantry.