Hello Alucard, You brought me interesting information ... very interesting. Let's do it by steps.
1)paraguay = eastern european
Well ... you really made me change my mind about Paraguay, why? Simply by using them my focus is on infantry so that the combination Auxiliary \ Skirmisher (Fully updated) made me ignore the advantages that Ukrainian immigrants offered, especially this pertaining to money, and also the improvement for the cavalry.
3) brazil = is hard to say between confederates or japanes , why ?
Here I'm sorry, but I disagree. Using the "Mass Immigration" card, the Brummer starts to cost just 1 population and fully updated it turns into a very powerful skirmisher, perhaps it is weaker only than the Habsburg Grenzer.
The factories supplied by them are also a great help, for although they can provide resources, to me they are free cannons, and speaking in cannon Krupp Kannone is the icing on the cake.
You speak Portuguese? or another Latin language?