Your joke inadvertently shows the error in your logic. “America” (in the sense of the nation) didn’t exist in 1493. Various Indian nations existed in this land. British people didn’t “immigrate” to those Indian societies. They created a new society on the land. They were settler colonizers, as the kids say these days.
fyi there were no Indian in North America in 1493. you are probably referring to First Nations or Native people.
> Your joke
I'm not amused. Are you amused?
> They created a new society on the land.
I see my message didn't quite get through.
You're almost there however. Think one step further: What stops the next "immigrants" from renaming your cute "society" that you currently have there, and declare a proper, civilized society, with a proper culture for once?