Answer:
because.... they had a constant supply of water. This means building cities and planting farms was much easier than it was in these places than others.
Hope that helps!! Have a good day!
good luck with your welcome to come and good luck to you too I hope you have left it's just saw your message about affixes
The main source of water in the Northwest of China are rivers and Lakes.
Hope this helps
Its called a diwa i think