My conspiracy theory is that it's a sneaky World War 2 reference by someone that went unnoticed by higher-up chess.com developers. This wouldn't surprise me with all the oversites on this site as highlighted by the many other forum posts. You can take your own guess at the meaning behind America being white and Japan being black.
Maybe if chess.com actually paid their own moderators there would be more effort to smoothing out these kinks
If you go to www.chess.com/analysis on PC and click 'make moves' it will link both a USA and JAP member account under the 'starting position' section. Clicking on their names will take you to their /member account URLs.
This link seems to have resulted in both accounts gaining thousands of views, the member account of 'Black' (JAP) especially with 43,000 views as of this post.
Interesting such a feature exists to highlight two lucky (or unlucky) member accounts. They're both active players, with White (USA) having 1400 games and Black (JAP) having 850 games.