I want to know the answer to the following question:
What did the US not want to see repeated?
All the background I'm provided with is that "Truman and Acheson discussed a U.S. invasion response and agreed that the United States was obligated to act, paralleling the North Korean invasion with Adolf Hitler's aggressions in the 1930s, with the conclusion being that the mistake of appeasement must not be repeated.". Is that enough to answer the question?