I'm attempting a USA WC, and I have managed to satellite Mexico and Canada by 1844. By 1849, I annexed Japan and Korea after a long, grueling war, which was one of my less enjoyable times in Victoria, but boy did it feel good to press the Annex button. The only problem is that now my country is 2/3rds or more Korean and Japanese, and my national culture pops make up about a quarter or less of the population. So how am I to make Japan and Korea into States? Is it even possible? Or am I supposed to use them as very large manpower and resource pools, and not industry centers for the whole game?