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.

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this forms a narrow, steep sided inlet (sometimes deeper than 1300 metres) connected to the sea. the terminal moraine pushed down the valley by the glacier is left underwater at the fjord’s entrance, causing the water at the neck of the fjord to be shallower than the main body of the fjord behind it.