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Brazilian rainforest is mostly on the state of Amazonas, Rondonia, Roraima, Acre, Pará and Amapa. There is no rainforest on half the country, and thats where most of the missing states are, the US states should not have more priority than Brazilian, venezuelan or british states, although i agree that all the missing states from all countries should exist.

The problem with Brazilian states in my opinion is not that many are "missing", but rather that the ones that are there are simply off. IIRC Sao Luís is not in the state of Pará in the game, for instance, nor is Manaus in Amazonas.