Various skirmishes during the Indian Wars.
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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.
WW2 in North Africa :- Montgomery - Rommel. The Sudan Wars :- Gordon
Yes, their were many wars in the 1700s. Most wars in the 1700s were fought over power/control over a colony by the European Colonial powers. Other wars were fought for other reasons, i.e. The American Revolution was fought to gain American independence, and etc...
Battle of hastings.
Crimean War