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As is commonly known, much of the white population of America is Germanic in origin. I heard somewhere that at one point English was chosen over German as the language of the US by only a slim margin. What if this had been different, and with some other changes, the United States becomes a nation of mainly German and not British influences?

Firstly, how could this happen? I don't know much pre-20th century history, so
I’m afraid I can’t add anything to this section. If a culturally German USA is implausible, please say why.

Second and most interestingly, what would the effects of a German Amerika be? How would the power of the British Empire be affected, would English or German (or neither) become the world's major language by the late 20th century, or how would the World Wars be affected?

Oh, and has this been done before?

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