There have been 13 full scale US wars but note there have been several US Military actions there were not wars but still had tremendous global effects American Revolution War with Tripoli War of 1812 Mexican American War US Civil War Spanish American war WW One WW Two Cold War Korean War Vietnam War Desert Storm War on Terror
5
Which war? US fought many many wars.
9...+9....= ?
2
Two
There's only been two world wars in the history of man.
we do not have many wars in our country
because they are stupid
WWII and WWI
55,000,000
How many? You think there has been MORE than two world wars? And in both cases, the US was involved. Honestly, some people.
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.