Answer:
The US Navy was aware of the traditional planning of the Imperial Japanese Navy for war with the US as maintained throughout the 1930s and into the 1940s. The Japanese made no secret of it, and in the 1930s American radio intelligence gave US war planners considerable insight into Japanese naval exercises. (hope this helps!)
The US Navy was aware of the Imperial Japanese Navy's conventional planning for conflict with the US that had been maintained during the 1930s and into the 1940s. The Japanese made no secret of it, and in the 1930s, American radio intelligence provided significant insight into Japanese naval maneuvers to US war strategists.
Japan planned the attack as a preventive measure. Its goal was to keep the United States Pacific Fleet from interfering with its planned military operations in Southeast Asia against the United Kingdom, the Netherlands, and the United States' overseas possessions.
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