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Why is the Korean War sometimes referred to as the “Forgotten War” even though many thousands lost their lives in that conflict?

a. because it did not last for very long and the participants did not fight very hard to achieve victory

b. because it took place in Asia while most well-known wars take place in Europe or America

c. because it occurred between two other great wars, World War II and the Vietnam War

d. because there was no clear victory or successful completion of the mission--for either side