Why does every state in germany have a different language?

i live in hallstadt germany, and yes im american, i speak some german but i cant understand anyone from east germany, and have problems understanding the people in unterfranken as well, i find it strange, that in one country people can not comunicate in one language, my wife is german and she also has problems with... show more i live in hallstadt germany, and yes im american, i speak some german but i cant understand anyone from east germany, and have problems understanding the people in unterfranken as well, i find it strange, that in one country people can not comunicate in one language, my wife is german and she also has problems with some areas, i realize its all a form of german but why dont we all use proper german, and no america does not have the same problem, we have normal english and then we have getto people who speak slang.
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