... technology ... Without it - for example, tell me, how well do you think Las Vegas' citizens would fare?
Las Vegas is locate on top of a marsh, that why people have been living in the area for thousands of years. Under the city there is a rather extensive flood control system, heavy rains every year.
The reason the early city was built there in the first place is because the old steam trains stopped there for water.
Without technology the community would be much smaller, but people would be living there.