Answer: I think it is <u><em>Cairo </em></u>
Answer:
For this reason, oases in the Sahara and throughout the world have become important stops along trade routes. Merchants and traders who travel along these routes must stop at oases to replenish food and water supplies. ... Rivers that flow through some deserts provide permanent sources of water for large, elongated oases.
Explanation:
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A drought that made growing food crops and finding fresh water difficult led to starvation and the drinking of contaminated water, which, along with the swampy area’s plentiful mosquitoes, contributed to the spread of deadly diseases. The settlers also faced conflict with the indigenous people and they had poor leadership in their community.