America was indeed unprepared, because the Liberal Democrats had cut the Military to the bone, even contemplating the elimination of the Marine Corps.
Extract from Oral History Interview with CLARK M. CLIFFORD Assistant to White
House Naval Aide, 1945-46; Special Counsel to the President, 1946-50. Washington,
D. C. March 16, 1972 by Jerry N. Hess.
"We weren't concerned about markets; we were concerned about preventing Soviet control of larger areas of the world than they already controlled. When the Second World War ended, France was decimated. England was almost brought to its knees, you'll remember, and if Hitler had moved at one time, he could have probably brought them to their knees. The Soviet Union had gone through the most traumatic experience of its career. I read that in the Second World War it's estimated that the Soviet Union lost between twenty-five and thirty million men. So I think they were just determined that it was never going to happen to them again.
But an enormous vacuum had been left in the free world by the end of World War II, and the Soviet Union was determined to move into that vacuum."
As for Liberal Democrats wanting to eliminate the Marines, that comment shows a total lack of knowledge about that endeavor. It went back to the end of WW I, when the Army got their nose out of joint about all the press the Marines got during the war, and after. Virtually every Army officer of any rank was out to do the Marines in. And they included the newly created USAF generals who attempted to do away with both Navy and Marine Corps aviation. Truman being a true blue Army vet of WW I had joined the chorus of Army, enemies of the Marine Corps.
After the second Sec. Def Louis Johnson, came into office, it was his mission to reduce the Marines to nothing. And he was most certainly no Liberal.
From: General Krulak's book - You Can’t Get There From Here: The Inchon Story