> The majority of Americans are of British ancestry
No they aren't.
Even if you narrow it down just to white Americans, British ancestry is almost even with German and does not hold a majority once you include Irish, Italian, etc. [1]
I don't blame you for thinking they are tough, as Anglo culture and language has been unusually dominant, probably because the original 13 colonies were very Anglo and the whites that trickled in later largely assimilated.
"Albion's seed" is an interesting book on this topic.
[1]: https://www.census.gov/library/stories/2023/10/2020-census-d...
Edit: British doesn't usually denote an ethnic group so I took it to mean Anglo, but if you take it to mean Anglo+Celtic then it would indeed make a majority of whites in the US due to the very large Irish population.