Why wasn’t Iran colonized by any country?

Unable to pay, the British and Russian governments reached an agreement that they would control and share the Persian revenue from various incomes. While the Persian Empire never agreed to this condition, it did prevent the country from being officially colonized.

Why was Iran not colonized?


Quote from video: And was now a major trade partner of persia. And it was shortly after this that persia came into contact with britain who clashed with them and the qajar dynasty lost control of these economically.