what is the difference

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just looked on the language settings on this site and they are English us or English USA,whats the difference... i wonder. :huh:  

[TheNinjaNextDor]

They do things like spell "colour" the American way of "color" etc.

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well to fair they are Canadian but my point was are they not the same language   

[Shd0w2]

They do things like spell "colour" the American way of "color" etc.

MURICA'

[nixproducer]

They do things like spell "colour" the American way of "color" etc.

and zed instead of z for some reason

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yeah i know never understand that

can i ask when did doctor who become BIG in north america?