Dude, if you are not familize about the American Indian issue please do not say anything. American Indian Conservation have their own land, except for taxation purpose, Federal US government CANNOT enforce its law on their own reservation. exccept of course serious and federal crime.
And dude, why would you need to say sorry to occupy Germany when they freaking LOSE A WAR? The whole Germany were occupied as per Allied demilitarisation plan, as far as i know GErmany lose the war twice, and Germany never re-annex Alsace-Lorraine after WW1. France own Alsace-Lorraine, if Germany Defeat France again, then they can talk.
Finally, yes Vietnam, Japan and Korea is also a single Strait people, but any one of this is in the permanent seat of the UNSC and anyone of this is in the world stage of Diplomacy?? NO, only China was under the spotlight as of now. They all have similar policy to China (Sucked up to one Sugar Daddy, China -> was Russia, Vietnam -> Still Russia, Japan -> Still US, Korean -> Still US.
All their dipomacy politic are the same, but only China is on the spot light as they claim they want to become a Superpower. Not Vietnam, not Japan, not Korea