Weegy: Douglas MacArthur was relieved of his command in the pacific by president Harry Truman because of his failures in the first two of the three phases of the Korean war, [ the first in trying to hold the communists at the 38th paralel (the border between North and South Korea), and then in trying to push the communist Chinese forces out of Korea, which he thought he had nearly done when he push them to the China- North Korean border, but in reality, the communists were withdrawing and ammasing their forces on the border, and when the UN troops were spread out thinly across all of Korea, they struck, pushing the UN forces all the way back to the 38th paralel and a little beyond.
Mcarthur also wanted to attack China (as they were sending troops to assist the North Koreans in return for their assistance during the Chinese civil war which took place during World War 2, which the communists won), using Chinese nationalist troops (the democratic Chinese forces left over from the civil war, which they had lost) to augment UN forces in a full out assault on China, after which he wanted to drop 30 to 50 nuclear bombs along the neck of Manchuria (the section of China that borders Korea), the prupose of which would be to turn the China- North Korea border into an impassable, "radioactive no man's land for sixty years".
This plan was not the reason for Mcarthurs' being removed from his command, though it probably pushed Truman to the decision, as a poll back in America had shown that the majority of the population did not favor an all out war with China.
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