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So instead of the US just defeating Mexico they had annexed it and made it part of Texas until they choose to be there own state if/when they choose to?
Would it have greatly boosted the GDP in the US over time as the new government improved and provided better services for those living there?
Would it have had a huge impact on the world wars manpower and production numbers for the United States?
Or would Mexico not really play a large roll in this ATL?