Why does lippmann advise the united states to concentrate its efforts on europe, not the rest of the world?

Making it an overall fight would made it difficult to see global emergencies on a case-by-case premise with a specific end goal to decide if it was really opportunity of others that spurred the U.S. or then again narrow minded interests. The ground forces essential for this were not in our ownership.

a.) d-day invasion of normandy.

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d: social contract theory