The United States and Japan have been the first and second largest economies since the early 70's, but this year, there was a change with China taking over the position occupied so long by Japan. With that said, the modern Japan of today only uses military forces for self defense purposes only. Maybe if we had invaded instead of dropping the bomb while wasting countless American and allied lives in the process, Japan might rank as the number one largest economy in the world today. Isn't all out World War hell when you're on the losing side.