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There is no big difference between North American auto companies and others in:
1. Wages (see shaunnarine's post previous - it's true), 2. Sales (nobody is buying anybody's cars), 3. Quality (look it up!).
The Confederate Senators are promulgating myths. Maybe they believe the myths. That would show that they are stupid. Probably, they are just cynical, and love the spotlight. Or, maybe, they are crazy. They may have an irrational hatred for unions, or for people without Southern accents.