Final answer:
The attack on Pearl Harbor was a direct result of the American embargo of oil and other materials to Japan.
Step-by-step explanation:
The announcement “Air raid Pearl Harbor. This is not a drill” could be considered a direct result of the American embargo of oil and other materials to Japan.
In an attempt to pressure Japan into ceasing its aggression, the United States imposed sanctions, including an embargo on oil and gas sales to Japan. This action reinforced Japan's plan to turn to the South Pacific to absorb natural resources. As a response, Japan planned a surprise assault on the naval base at Pearl Harbor, Hawaii.
The attack on Pearl Harbor on December 7, 1941, was a direct result of the American embargo and Japan's desire to prevent U.S. interference in their expansionist plans in Southeast Asia.