Phoenix, Arizona has been a longtime hub for aerospace and defense and now it’s becoming an epicenter of semiconductor manufacturing and autonomous vehicles. TSMC recently completed the most advanced chip fab on U.S. soil and has pledged to invest $65 billion in the area. The city is also where Waymo launched its commercial robotaxi service, and now it’s the new home of Amazon’s long-awaited Prime Air drone delivery service. CNBC’s Kate Rooney explores how the city became a hot spot for tech.