AHC: As many combatants as possible in WWI

How can WWI be expanded to include as many combatants as possible?
I think that several countries can be addes, such as
1) Sweden on the CP as a result of Essen being listened to
2) Germany probably could have pressured the Danes to join the CP
3) If the Germans invaded through Limburg the Dutch would join the Entente
4) More stable Ethiopia allows them to join the CP
5) It might be possible for Luxembourg to declare war on Germany rather than be occupied
6) Afghanistan might be convinced to join the CP
7) Argentina and/or Chile could be pressured into the Entente

What do you think of these countries? Are there any more that could be added? Also, who would win if these countries were added?
 

Magical123

Banned
Perhaps Persia could join the entente? Spain the CP?

Perhaps some of the Latin American states might join the Entente Mexico might join the CP if you somehow the butterfly the Mexican Civil War, maybe have San Marino join the allies, Luxembourg might join the allies-or maybe not there just a big bank on land after all, might get the Dutch to join the allies, Maybe get Mongolia to join the central powers?
 
Several Latin American countries might join to war with good POD.

Perhaps Siam would go side of CPs if it would be more viable nation.

Perhaps Norway on some reason.

Persia and Afghanistan are possible.
 
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