It's been 10 years since the Palo Verde nuclear power plant had a major accident, that was worse than Fukushima, but less than that of Chernobyl. Prevailing westerly winds carried the fallout from the accident over the Phoenix metropolitan area, causing large swathes of the city to be evacuated, and then finally abandoned.
What would have happened if there was no such accident? Would Arizona still thrive? Would the US use more nuclear power?