just in general, add more resources in south America, if it is to specify more steel for Minas Gerais, São Paulo, Rio Grande do Sul, Mato Grosso and Rio de Janeiro for Brazil, but as dedcision to dedvelop more (same for oil but for all SA countries).
More rubber in all of the amazon rainforest states, except the colonies ones. Aluminium for the barazilian Guyana (Amapá).

Ok i will look into this.

I just gave some resources, mostly Brazil cause it's the one everyone plays it, but other nations need it too.

More in the Baltic countries would be nice (Lithuania, Latvia and Estonia), nothing specific, just an overall buff to the region since it is severely lacking resources within the base game.

Argentina:

Santa Cruz, Los Andes, Túcuman, San Luis y la Pampa, San Juan y la Rioja: Steel

Mendoza, Buenos Aires, Chubut: Oil