Why did people move to Baghdad region by early part of the 8th century?

Center of learning (8th to 9th centuries) Founder, caliph al-Mansur of the Abbasid caliphate, chose the city's location because of its critical link in trade routes, mild climate, topography (critical for fortification), and proximity to water.

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Founder, caliph al-Mansur of the Abbasid caliphate, chose the city's location because of its critical link in trade routes, mild climate, topography (critical for fortification), and proximity to water.

Hope this helps :)

so they can defeat there oppenent