One major problem facing the county governments with cities like las vegas, phoenix, and san antonio is a. low population density b. rapidly increasing populations c. frequent electricity shortages and rolling blackouts d. earthquake damage

One major problem facing the county governments with cities like Las Vegas, Phoenix, and San Antonio is rapidly increasing populations. Option B is correct.

The 2010 Census reported  308.7 million people in the  United States, a 9.7 percent  increase from the Census 2000  population of 281.4 million.

According to the census, Nevada was the fastest-growing  state between 2000 and 2010,  growing by 35.1 percent.

The ten most populous states home  54.0 percent of the U.S. population  in 2010.

an ethnic enclave is a geographic area with high ethnic concentration,

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