As Apple seeks to re-shore more chip production, TSMC invests an additional $20 billion in its Arizona plants even while Intel allegedly ramps up test production. US manufacturing of Apple processors was already increasing with Intel reportedly conducting a test run of iPhone and Mac chipsets, but now TSMC has approved $20 billion more for its Arizona Fab 21 facility. It's all because of both political pressures worldwide, and global shortages leading to more processor plants being needed. According to TechPower , the decision to increase the Arizona investment included the possibility of TSMC increasing it still further in future. The confirmation of the $20 billion may be new, though, but it also fits a report by Nikkei Asia in December 2025 that said TSMC would be moving chipmaking tools into its second Arizona plant around summer 2026. But that report and this new confirmation also fits how TSMC's CEO C. C.…