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Two things that I'm thinking of.
First, you say that you added ethnic groups; remember that OOTP only uses up to 39 ethnicities, meaning that if you add a 40th one, it will not be taken into consideration (basically, you have to modify one of the existing ethnicities instead of adding a new one).
The other thing is that when you set up a new league and choose a region for it, you will only be able to select nations from inside that region. This is editable at the end of the world.xml file.
I'm really not the most knowledgable person here and while you wait a more complete answer from someone else, it could be something to look at.
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