Yes, yes yes, I know about 1953, and 1905, and 1921 and 1963.
None if those incidents broke the 2,500 year run of Imperial statehood Go back and ◊◊◊◊◊◊◊ well READ what I actually said...
"1979 was the first time in its history that Imperial rule was overthrown, AND A REPUBLIC PUT IN ITS PLACE"
Now pay attention, you might learn something.
Iran/Persia had an unbroken monarchy for over 2,500 years, at least as far back as the founding of the Achaemenid Empire (c. 550) by
Cyrus the Great. Some have argued that the Median Dynasty preceded them, but there is some dispute about this (that is why I said "at least").
en.wikipedia.org
If you want to learn something, check this out of you local library
Persians: The Age of The Great Kings : Llewellyn-Jones, Lloyd: Amazon.com.au: Books
www.amazon.com.au