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Which country is the leading manufacturer of automobiles?

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Either America or Japan. Most Likely Japan.
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Who is the largest automobile manufacturer in the world?

It's a tight bunch in the top 3 so it can change from year to year,  but right now as of February 2014, Toyota is the  top selling automobile manufacturer in the world with

Countries which are major manufacturers of automobiles?

Japan produces the most cars in the world. Some well known Japanese car companies include Mitsubishi, Toyota, Honda, Nissan, Mazda, Subaru, Isuzu, Suzuki, Hino, Kawasaki, Yama