As Columbia, when I add countries like Brazil, Chile, Argentina to my sphere, my economy tanks like crazy. I'll go from +30 to -100, and no matter how much I raise taxes, my income continues to plummet. What are some likely causes and how do I stabilize the situation?
The only thing I can think of is that the new sphere nations have RGOs that go into your market and compete with the RGO resources in your country. This may decrease your tax base because the prices drop because all of a sudden, say coffee, becomes way more plentiful. Are you getting unemployment from your RGOs also? If so this might be the problem. Other than that I really can't hazard a guess why.