Given how that campaign ended for Charles, I hope not!

“Non-imperialist”? What?

First in all of history? I highly doubt that.

Relatedly, I find that with regards to history, most people have quite a large recency bias. If I ask someone who the greatest actors of all time are, at least half will be within the last several years. Same with this question, the first non imperialist great power is likely some random Chinese or Mesopotamian or African kingdom.

Non-imperialist at the time maybe?

That must be why it's a coincidence, then, because it's a date in the year that surely some people must have birthdays, anniversaries, etc. on. I didn't think that was unusual for dates, though.

which is probably why the person you're replying to didn't say "July 4th only occurs in the US of A" but instead said "July 4th is only celebrated in the US of A"

You'd be hard-pressed to find it occuring in Iran.