Currently, the manner in which Paraguay is represented in 1836 is largely inaccurate, as it controls areas of the Chaco region that it wouldn't gain sovereignity over until the 1930s. The provinces of Bahia Negra and Puerto Guarani should be given to Bolivia from the start, Fortin Falcon could be given to Bolivia too, but while it'd give Paraguay somewhat historical borders, it'd make Bolivia look rather strange given the shape of the map, so I'm ambivalent on that.