I’ve been doing research on lesser known conflicts and wars and I feel like I’ve come up with a theory concerning Japan’s confidence that they could beat America in WW2 and I was wondering if there’s any evidence that it’s correct. The Russo-Japanese war was won by Japan and I imagine that their victory against Russia and their victory over China in the First Sino-Japanese war caused them to believe they were invincible. Is it possible that without these two victories they wouldn’t of had the confidence to bomb Pearl Harbor? From what I’ve read they didn’t suffer many losses before WW2, and even with the knowledge that the United States played a big role in the allied victory during WW1 maybe they honestly thought it would be an easy win.