An occupied Oahu and nuclear warning would harden American war aims

Would the United States seek peace if Japan occupied Oahu and demonstrated a nuclear weapon off the West Coast?

No. Occupying Oahu would delay American operations, but a nuclear demonstration would harden war aims, accelerate nuclear production, and create a continental air-defense system.

A successful occupation of Oahu could seize surviving ships and facilities while forcing the United States to rebuild enough strength to retake Hawaii before advancing west. That delay would reshape the allocation of American forces to the Pacific and Europe. A Japanese nuclear demonstration on the West Coast would be unlikely to produce the intended peace signal. It would instead accelerate an American nuclear race and a vast air-defense network extending through Alaska, Canada, the United States, and Mexico.