Why did Douglas MacArthur get fired during Korean War?

Answer 1

MacArthur believed that expanding the war and moving forces to the Yalu, along with use of additional friendly forces would force China to stop fighting in support of North Korea and result in final victory for UN forces. MacArthur was aware that Chinese forces were already supporting North Korean forces, but was unaware of the massing of forces taking place in China and being encouraged by China in Russia that may have preempted his proposed strategy. Truman was afraid this strategy would bring Russia into the war and potentially could lead to atomic war, and therefore wanted to use a "containment strategy" that would limit the scope and avoid expansion of additional international involvement. MacArthur was outspoken and aggressive in his pursuit of following through on his plans and disobeyed the lawful order of the President to obtain clearance. Despite the obvious liabilities associated with dismissing an extremely beloved commander, Truman's hand was forced and MacArthur was dismissed.

Answer 2

Insubordination . Doug was planning to drop several nukes along border to cut off re supply to from China This plan was nixed, His subsequent push Northward was counter to early truce plans, talks in Paris stalled, and then Chinese involvement drives UN force back to 38th Parallel still the present day border.