Well Outcasts and Corsairs both have Hispanic names in Vanilla; the NPCs do. So both are Hispanic in Vanilla. I've seen the name Pedro Ortiz on both Outcast ships and Corsair ships in Vanilla. There is no racism here. Roberts included white criminals too, the Rouges (First names like Art, John, Jack, Bob, are common in Liberty Rogue ships [in Vanilla]).
And part of the reason why other countries like the aforementioned Brazil weren't big in the lore was, well, because they aren't really big in world politics now or were back in 2003 when this game was made. Besides the Olympics going on now Brazil isn't in the news much. But the main countries that you hear of in the news or talked about are Russia, US, Great Britain, etc. If you were an alien coming from space somewhere (not nomad) you would see earth and most likely learn the names of Russia, US, Britain, Germany, etc. quickly due to them being big players in the world and in the news more often than say, Latvia or Slovenia.
The Coalition consisted of Russia, China, (probs North Korea), Middle East and North Africa. They most likely included the old Eastern bloc countries in the Coalition. (Serbia, Croatia, anything that was Yugoslavia, etc.) That is my theory on this whole thread. Kudos to the start of the thread, love the geography.