In the Ghettos, monitored by Nazi guards
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The answer is: Water management projects created huge reservoirs and lakes where there had been dry canyons.
The National Reclamation Act of 1902 was a federal law that was passed in order for the federal government to start major irrigation projects in the West.
The result of these major projects was the creation of complex structures and systems(reservoirs and lakes) that would allow for the transformation of arid lands into farm capable lands.
They lived in what was normal in those times. The Islamic traders dealt with a wide variety of goods, including sugar, salt, textiles, and spices. The way that they lived back then allowed the traders to travel all the way from Europe to China. Also, they were most likely wealthy and powerful.