How does American late 20th century dominance compare to British late 21st century dominance?

by iRoygbiv
HowdyDooDee

The late 21st century isn't even upon us yet.

wee_little_puppetman

You probably meant late 19th century British dominance. Since you can't edit titles, I ask you to resubmit this thread. I've deleted it for now. And could you also mention the 20-year rule in the question? Thank you.