The two sides were:
Yes , for example World Wars 1 and 2 .
625,000 Civil War (both sides USA) 116,516 WW1 416,800 WW2 36,516 Korea 58,209 Viet Nam
Korea did not fight in world war 2. So the answer is no.
it spilt in 2 North Korea and South Korea
US and USSR
United States supported South Korea after World War 2.
United States supported South Korea after World War 2.
United States supported South Korea after World War 2.
United States supported South Korea after World War 2.
Korea seperated 5 years after end of World War 2
Korea
38th parallel divided North and South Korea at the end of World War 2.