Tainan and Chandler, Arizona are deepening ties around chipmaking, a friendly sign of how TSMC's Arizona investment is pulling the two places closer.

• Chandler Mayor Kevin Hartke led a delegation to Tainan's city government to mark 10 years of the sister-city link signed in 2016.
• Both sides want more cooperation in trade, tech, culture, sports, and student exchanges.
• TSMC's factories in Arizona are the driver, tying Taiwan and Arizona together through jobs, schools, and business.
• Chandler and Tainan followed the same path: farm towns that turned into chip hubs, with Intel, Microchip, and NXP building out Arizona's "Silicon Desert."

Outlook: The Chandler group heads to Taipei's semiconductor trade show in early September, where more investment talk is expected.