This is an Anglo-Saxon country.
Maybe we didnt originate here but for over 1000 years we have been here.We survived the Normans.Many Englishmen found sanctuary in Scandanavia,before returning.
Taken over by stealth - means they didnt advertise the fact that the
monarchy and the banking families moved here in early 1700s and never left.
All the lands they "seized" were appropriated to the Crown ie the Square Mile City of London which is an independent entity from the rest of England.
While this was happening,most of the population lived in poverty.
So your ancestors seized it before they did? Sure, that's justification. What about the Celts? Or the Britons who used to live on the whole island before the Saxons and Normans forced them into Wales?
You are aware the house of Windsor is descended from William the Conqueror, right? What on Earth are you getting at, saying the monarchy is German? They're no more German than the Saxons (who I guess technically were Germanic). The English language itself is a bastardized hybrid of Germanic languages with French, Latin, and Greek roots thrown in.
You've been hanging out on 4-chan and reddit too much. In the 1700s, England was invading everyone else, not the other way around. You were the most powerful country on earth.