Final answer:
MacArthur was relieved of his command by Truman for insubordination after publicly questioning the rejection of his plan to expand the war into China.
Explanation:
In response to Truman rejecting his plan to expand the war into China, MacArthur publicly questioned the decision. Truman, viewing MacArthur's actions as insubordination and potentially dangerous, relieved him of his command. Many Americans supported MacArthur's call to expand the war, but Truman maintained his limited war strategy.
Learn more about MacArthur's dismissal by Truman here:
https://brainly.com/question/21813077
