^^^ from our resident Iowa Corn Advocate...kidding...
Just like any industry there are areas/suppliers/producers that can produce corn in a more efficient way than other parts of the country. Iowa happens to be an ideal location/situation for AG productions due to a variety of factors, just like Kansas and wheat or Nebraska and corn or Illinois and soy beans.
China can produce the hell out of cheap steel / iron / aluminum but they take short cuts and don't give a crap about the environment OR fair trade.
The U.S. has loads of marginal / hilly ground being farmed and in production that really shouldn't. Our buddy Forkin Crazy down on the Mississippi has some great bench soil and unlimited water, that is ideal for corn/bean/cotton/grain production AND there is alot of that type of land in this country (river bottom land).
Some areas are harder to farm and require more fertilizer / pest control / cultivation. Some areas are more prone to run off and siltation of the watershed.
Iowa is ideal and some Missouri hill ground, not so much.
Missouri used to be the largest producer of HEMP in the nation back in the hemp rope / hemp fiber days... It really grows great here, lets bring it back (gubment effed that all up)...We also used to be a HUGE producer of tomatos and there were many canneries for the tomatos, now it is NILL/gone...
You can grow a palm tree in North Dakota but it will do MUCH better in SoCal or FLA... <<<
^^^ ALL of this to say that there are MANY factors and MANY political pressures effecting all of this ethanol discussion.
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