In this alt-future, the atomic bombs are not used on Japan, and instead Operation Downfall takes place, with millions of casualties.
By 1950, Japan is divided into north and south, just like Korea. The United States and allies also intervened in the Chinese Civil War, aiding the Kuomintang, resulting in the Republic of China holding onto much of South China including Shanghai, as well as Tibet.
By 2030, a reunified democratic China has reached superpower status and remains aligned with the United States. Korea and Japan also reunified by 2030 and 2036, respectively.