How come only the US version of the Xbox 360 is backward compatible?

Question by meter: How come only the US version of the Xbox 360 is backward compatible?
The US version Xbox 360 is backward compatible with most Xbox games, but the japanese is compatible only with a few. The list is given here

http://en.wikipedia.org/wiki/List_of_Xbox_games_compatible_with_Xbox_360


Best answer:
Answer by ¤Equinox¤Because the government set that up

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