A civil war occurs when 2 or more factions fight to control a single government. The Revolutionary and the "civil war" were both fought to create a separate government, and technically not civil wars.
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The Civil war and world war 2
A comparison of the Revolutionary war and the civil war. How the Revolutionary was different from the civil war A comparison of two wars The Differences between the Revolution and the Civil War
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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.
There were a few technological advancements that directly impacted warfare during the American Civil War. Two things were the railroad and the Gatling Gun.