The korean war was the war in which the united nations played a military role.

Second.

Explanation:

As the United States of America had already played a military role on the second world war as the first time they had it, the Korean War would be the second, but not the last, since the american military was involved in other wars, like the vietnam war. This rules out the other two options which are the first and last, so the correct answer is:

The Korean War was the Second war in which the United Nations played a military role.

do but i don't go there

explanation:

btw this is in middle school stuff lol

i also think he is correct. i believe they came to washington to protest their rights.