On March 21, 1935, Reza Shah Pahlavi asked the world to stop calling his country Persia and use Iran instead, marking a turning point in modern Middle Eastern history. The change symbolised national sovereignty, cultural self-definition, and a break from colonial-era perceptions. From oil politics and the 1953 coup to the 1979 revolution and the Strait of Hormuz, the renaming of Iran became deeply tied to global geopolitics and energy power.