That’s one of the reasons I used the word “primarily”, which is a word that I would defend. Even if many Americans don’t personally have much English descent, the shared cultural narrative of the country starts there. The central complaint of the American Revolution was that the British were infringing on our traditional “rights of Englishmen”, which evolved over centuries. We’ve retained the English language and the English common law. Many of our cultural and regional variations to this day, even down to our regional dialects, can be traced to those that existed in different parts of England.

Also, please find a reliable citation that says that more Americans have African than English heritage. That strikes me as a very surprising claim.