Saving Iran: Reza Shah in 1925
Losing Iran: British and Russian occupation in 1941
Saving Iran: Appointment of Mohammed Reza Shah
Losing Iran Forever: 1953 Revolution
Sources (in order) :
(Please note I didn't reference ALL of these and they contain details that I left out because I deemed them too tangential to the larger picture. However the details omitted do not change anything, otherwise I would have included them. Duh.)
https://www.britannica.com/biography/Reza-Shah-Pahlavi
https://www.britannica.com/biography/Mohammad-Reza-Shah-Pahlavi
https://www.youtube.com/watch?v=MY-X8pxcXWQ
https://encyclopedia.ushmm.org/content/en/article/iran-during-world-war-ii
https://www.youtube.com/watch?v=jxv9hZzq920
https://nsarchive2.gwu.edu/NSAEBB/NSAEBB435/
https://apnews.com/c037d5af8b3b4be6ae47f125d847d0f0
https://www.history.com/this-day-in-history/cia-assisted-coup-overthrows-government-of-iran