Because the nation was not in the real war.
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Activity got involved in the first Persian gulf war-- Apex
The US didn't want to be involved into "European Affairs". Actually, isolationism has been the US policy until Pearl Harbor.
Russia was not involved in the US Civil War. A civil war is defined as a war fought between groups which are all from one country.
Isolation. Congress didn't want to get involved in the problems of Europe.
The First and the Second Gulf War. The third Iraqi conflict involving the USA is the war against the IS.