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Do you mean that the U.S.A. disconnect with Canada and Mexico beucase if that's the case then, they would not get soft wood lumber from Canada or any of the great imports from Mexico. now if you asked what happens if America closes its borders with Mexico because Immigration topic, then prehaps nothing due to the fact taht they would only close it to the Illegal alians/

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13y ago

What else can I help you with?