What did the United States do as its initial response to the Japanese attack on Pearl Harbor?

The surprise attack shocked the nation and directly led to the American entry into World War II in both Pacific and European theaters. The U.S. declared war on Japan on Dec. 8, 1941. Both Germany and Italy declared war on the U.S. on Dec. 11, and the U.S. reciprocated the same day.

Explanation:

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the western roman empire flourished, but the eastern portion of the empire struggled.