Fighting has been going on ever since two people decided to eat the same food,
but "war" didn't begin until there were fixed setelments - after the development of agriculture
SO ...
the first wars were fought about 5000 or 6000 years ago in places like Sumer and Ur.
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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.
Georgia has been through one hundred wars.
a lot
Over the past 200 years, there have been many military conflicts and wars that the US did not participate in.Crimean WarRusso-Japanese WarFranko-Prussian War
None, so far