The more I think about it, the more I'd say that there should be changes to the Southwest to reflect a failed invasion before everything broke down. Also I believe that what forces survive would drift back for internal security and relief duties or turn marauder. The invasion allows insurgent groups on both sides to upgrade their gear. La Familia has some real life inspiration and can be considered the Mexican New America. In the South the Marxist guerillas rise again, etc.
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