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Bernbart, your premise is off. Ford does what Toyota (and Nissan, and Honda, and GM, and etc.) do -- they build and sell cars in the US market that sell in the US market. They build and sell in the Euro market vehicles that sell in the Euro market. As long as there is little incentive for Americans to buy small, fuel-efficient, less polluting cars, and plenty of incentive (read, cheap gas) to buy bigger, more powerful ones, they will.
Tax Gas. Tax Horsepower. Then you'll see a change, or enough revenue to create pub-trans alternatives.
PS -- Ford also sells small, fuel-efficient Japanese cars in the US, they're just branded Mazda.