The U.S.A isn't even much of a real heritage in the first place.
But, it's dominated by British lowlifes, basically the trash Europe didn't want went to Britain, and the trash Britain didn't want went to the U.S.A.
The USA is full of people from all over the world. Our multiculturalism and spirit of providing opportunity for immigrates from all over the world has been a source of pride for many Americans. If you live here then you are living in the wrong country for your POV. You should be grateful. You can move to some segregated white supremacist bubble country and build your strength while we all dilute ours. That is only going to help your people in the future, i don't see why you would fight that.
British Islanders including English, Scottish, Welsh, Scots-Irish, and Irish probably make up at least 50% of the U.S Whites. (Although detecting it is a bit harder because many British Americans identify as American first)
So, it's not really a faulty statement to point out that a lot of Americans are Brits.
You know there's a difference between a British heritage and being a Brit, right?
Much of my family originated in Great Britain, but since that was over 200 years ago, I'm not a Brit; I'm an American.
Well, a lot of the Brits in the U.S, are different than ones in the U.K.
Because a lot of Brits came to the U.S, to take advantage of Colonialism, escape the high alcohol taxes of Britain (Whiskey Rebellion)
not to mention religious, and penal colony prisoners.
So, absolutely, a lot of Brits in the U.S.A, are of the lowest caste of the Brits.