While the American Navy suffered a tactical defeat in the Battle of the Coral Sea (it lost a huge fleet carrier, while the Japanese only lost a light carrier), but achieved an important strategic win: The Americans managed to stop a major Japanese attack aimed at cutting off what location from the rest of the Allies.

Answer Australia

Despite the loss of the USS Lexington, the American Navy had pulled off what had been impossible up to that point: They actually turned back a Japanese force, allowing the Allies to remain in contact with their vital ally, Australia.

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