Answer: a.k.a the Federal Army or Northern Army who fought for the Union (or North)
Explanation:
The Union Army (aka the Federal Army, or Northern Army) was the army that fought for the Union (or North) during the the American Civil War. Actually, it was comprised of several armies, to cover the many departments (geographic regions) in which the war was fought.
The Korean War--The goal of the UN was to establish an independent Korea and have elections however the elections were pushed off and did not occur.
In an effort to have a unified Korea, the North invaded the South which resulted in UN action to protect the South. Though the UN with the aide of the US were able to push back North Korean forces, China will join and push the defensive forces back again. The end result was an armistice leaving Korea divided still today.
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Normandy, France. The Normandy invasion