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There's no difference except in which regions they are best suited for. It's all about energy. Wheat and rice compete for calories; there was a time where South Carolina was the major producer of rice.
Supply and demand rules all reality. The entire world is demanding my country provide food for them as a "human right" that we have to work for. There is no such thing as a "right" that is not backed up by force. Which is why we are on the path to war.