The Korean War was the second war in which the United Nations played a military role. The correct option among all the options given in the question is the second option. It was the toughest test for the United Nations after its inception. It was clear that the United Nations forces sent to Korea was dominated by American soldiers, but several other countries did participate in it.
is found to have solidified in a new shape. And the magic of fire has yet more to offer. ... The use of fire thus makes possible two significant new steps in the development of metallurgy
