I think that CSAball should have Nazi Germanyball, and Sovietball both be in the neutral category, because Nazi, and Soviet all don't like USA, and Russian Empireball in enemies for supporting the Union during the Civil War.
And USAball should have a "FUCKING ASSHOLES" category, witch means the USA's worst enemies like Nazi, CSA, ISIS, Empire of Japan, etc.
That's just my ideas, that's all.