I`m actually surprised there has never been a German country in America, after all 30% of all US citizens have German ancestors. More US citizens have German ancestry than English ancestry.
I guess if a major player like Prussia or Austria would have supported a colony that would have changed.
The German-descended population is closer to 17% actually, if you're counting the whole United States population and not just non-Hispanic whites.
The English-descended population is much bigger in reality than it is on paper, because the census data only relies on self-reported identification. The 2010 American Community Survey only counted 9% of the population having English heritage, but also counted a significant number of people claiming "American" ancestry, especially in the southern states which were heavily settled by English colonists. Also, the 1980 Census reported 26% of the population having English ancestry when “English" was listed as one of the options on paper.
Anyway, German states won't have big colonies in the New World because Germany didn't unify until too late and Austria wasn't in a good geographic position to pursue overseas colonies.