What U. S. action at Pearl Harbor ended up helping the Japanese? The United States had not installed radar at Pearl Harbor.
The U. S. aircraft carriers assigned to Pearl Harbor were not present when the attack occurred.
The U. S. had its ships and planes lined up, making them easy targets for Japanese aircraft.
The United States had no intelligence network in the Pacific.

The U.S. Was Trying to Stop Japan's Global Expansion

In September 1940, Japan signed the Tripartite Pact with Germany and Italy, the two fascist regimes then at war with the Allies. Tokyo and Washington negotiated for months leading up to the Pearl Harbor attack, without success .please mark me branlist

So even if the Japanese hadn't attacked Pearl Harbor, their imperial ambitions for Southeast Asia would eventually bring them into conflict with Uncle Sam. FDR had already persuaded Congress to pass the Lend-Lease Act in March 1941 to ensure military aid was being provided to those fighting the Axis Powers.

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