More countries in WWI? (asked yet again)

Now, for the Allies:

Brazil probably not, unless there was a Latin American theater- "The opposition of the population to war, the lack of a clear foreign policy and a military-industrial infrastructure, as well as internal problems prevented the country have increased participation in the conflict."

Not sure what role Siam, Liberia, Haiti, Andorra, and Latin America would have done. Probably just sit on the sidelines since there's no Pacific war.

Just why did the TL-191 Great War have a Latin American theater?

Random Polish militias, the Czechoslovak Legions, and for some reason Hejaz is listed (as opposed to all of Arabia).

Okay, I guess none of the above really had much of a role in the war, and it would be unlikely for them to.

Neutral states:

Sweden and Denmark we've already talked about. Netherlands would also be a very possible combatant- it's close to the fighting, after all. Finally, Spain is a treaty-bound ally of the U.K.- I wonder what role it could have played at all.

Ethiopia - received a German diplomatic mission trying to convince it to act against the British in Africa
Ooh, that could be interesting!
 
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