How were the Japanese able to surprise the US at Pearl Harbor? Japanese land forces had invaded Hawaii unnoticed. Japanese submarines invaded Pearl Harbor unnoticed. Japanese airplanes had flown to the US mainland unnoticed. Japanese aircraft carriers had approached Hawaii unnoticed.

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Answer:

Japanese aircraft carriers had approached Hawaii unnoticed.

The form in which Japaneses were able to surprise the US at Pearl Harbor is:

  • Japanese aircraft carriers had approached Hawaii unnoticed.

Pearl Harbor

The attack on the American base at Pearl Harbor by the Japanese Navy on December 7, 1941 had many reasons for its effectiveness, among which are:

  • The inadvertent approach of aircraft carriers to Hawaii.
  • There was no declaration of war by Japan.

At this, the Japanese launched their planes and sent mini submarines to attack the base, which brought about the full addition of the United States to World War II.

If you want to learn more about Pearl Harbor, you can visit the following link: https://brainly.com/question/823370