So, I finished the novels a few years ago. I was wondering what could happen with a more Japan focused America. Do the Americans even care about Europe afterwards? Did someone actually proposed to deport all Japanese Americans to Hawaii?
To be fair, historically speaking, the US strategic situation once they entered the war did have a significant amount of resources and men devoted to fighting Japan despite agreeing with the British to commit to a "Germany First" grand strategy. The issue was that, for the US, the Japanese posed the more immediate threat to US and allied forces in the Pacific due to their naval capabilities. The Japanese needed to be checked in the Pacific. And with the Fall of the Philippines in early 1942, plus the naval battles of the Coral Sea, Java Sea, and Midway, the US had to devote alot of men to even have enough force to stop the Japanese.
In a way the US was already kind of focusing much of its attention on the Japanese, especially when it came to naval and marine forces. Alot of the Army was deployed to Europe, but the vast majority of the US Navy and pretty much all of the USMC was dedicated to fighting Japan. While the U-Boat threat to shipping in the Atlantic was significant and even though the US assisted greatly in reducing that threat the Japanese had the greatest navy out of the Axis powers. That threat alone was enough to make the US focus is navy mostly on the Pacific, especially since the Royal Navy was stretched thin fighting across the Atlantic, Mediterranean, and Pacific. The US couldn't simply fight a defensive war against Japan, it needed to check and counter attack to attain more favorable positions to enable future offensive actions.
I will say though, with a timeline that has Hawaii being lost to the Japanese, this might mean that the "Germany First" strategy has some serious and very vocal opposition. I'm not sure that even loosing Hawaii would mean the US changes its grand strategy with the British, but definitely means that resources will have to be allocated very differently in this timeline. The war will have to be extended for sure too.