The US fought three wars to obtain land:
1. Indian Wars (1620-1890)
2. Mexican War (1846-1848)
3. Spanish-American War 1898
The Vietnam War
If you mean the northern states, they fought in the Civil War. Other than that one time, the US has always been united. Any wars which involved the north, involved the entire US. The US has, of course, fought in two world wars and many other wars.
Because the US Army manages US wars; the US Army has jurisdiction over land wars. USAF & USN SUPPORT the US Army. The US Army always preferred to study Europe for future wars; the US Army absolutely did not want to fight any Asian Wars. Money (Defense Budgets) were 99% allocated for European Wars. Asia represented a dirty filthy ruthless war fought without mercy. Europe represented chivalry and the fine art of hi-tech weapons.
The ongoing Frontier Wars were being fought by the US Army up until 1890. In 1876 the US Army lost a battle to the Sioux at the Little Big Horn. The US Civil War was fought between 1861-1865. War with Mexico from 1846 to 1848. War with Britain in 1812.
World War 1 and World War 2 were the last declared wars that the US participated in.I'm sure however that there have been small regional warsafter World War 2, that the US did not participate in that were declared wars by the regional participants in those wars.
The US has fought several wars.
The US Army has jurisdiction over all land wars.
The Seminole Indians and the US.
The Vietnam War
WWII and WWI
If you mean the northern states, they fought in the Civil War. Other than that one time, the US has always been united. Any wars which involved the north, involved the entire US. The US has, of course, fought in two world wars and many other wars.
Which war? US fought many many wars.
55,000,000
Because the US Army manages US wars; the US Army has jurisdiction over land wars. USAF & USN SUPPORT the US Army. The US Army always preferred to study Europe for future wars; the US Army absolutely did not want to fight any Asian Wars. Money (Defense Budgets) were 99% allocated for European Wars. Asia represented a dirty filthy ruthless war fought without mercy. Europe represented chivalry and the fine art of hi-tech weapons.
Spain and the US.
There isn't a specific answer to that
yes