england and american culture is massively influenced by their colonial efforts. english culture is partly indian, french, canadian, african, etc. american culture is all over the place. obviously language itself is cultural, so everyone has SOME culture. but in many white european countries, the white peoples' culture includes other races' culture so its not exclusively white culture.
there are people with exclusive culture that we consider white now like russians and italians and greeks, but those weren't always considered white people