Task: Question Generation
Input (English): By the 1500s, Ismail I from Ardabil, established the Safavid Dynasty, with Tabriz as the capital. Beginning with Azerbaijan, he subsequently extended his authority over all of the Iranian territories, and established an intermittent Iranian hegemony over the vast relative regions, reasserting the Iranian identity within large parts of the Greater Iran. Iran was predominantly Sunni, but Ismail instigated a forced conversion to the Shia branch of Islam, by which the Shia Islam spread throughout the Safavid territories in the Caucasus, Iran, Anatolia, and Mesopotamia. As a result, thereof, the modern-day Iran is the only official Shia nation of the world, with it holding an absolute majority in Iran and the Republic of Azerbaijan, having there the 1st and 2nd highest number of Shia inhabitants by population percentage in the world.
Output (English): Ismail I forced a conversion to what Islamic branch?