I would absolutely not say that. The British Empire encompassed more than a quarter of the population, and in the 1870s the US became the world's largest nation

I would absolutely not say that. The British Empire encompassed more than a quarter of the population, and in the 1870s the US became the world's largest national economy. I think what you're thinking about is when English supremacy started, that can probably be dated to the post-WWII world when the US economy was far ahead of everyone else for decades.