The friendly chokehold — how $250B of U.S. memory policy runs through one Taiwanese-owned plant

Micron's $250 billion U.S. memory buildout still runs through one Taiwanese-owned building in Sherman, Texas. This is where the structural vulnerability becomes visible: the moment a national industrial policy depends on a single allied-foreign-owned chokepoint, the policy cannot substitute the output — it buys capacity, not control.

The popular read is reassurance — Micron is investing $500 million in a U.S. supplier, raising its domestic commitment to more than $250 billion, pouring the first concrete at Clay, New York a quarter ahead of schedule. The structural read is the opposite. Roughly 85 percent of the world's 300mm raw silicon wafer capacity — the round silicon discs that chips are cut from — sits with five suppliers, and Shin-Etsu and SUMCO alone hold more than half. The one advanced 300mm raw-wafer line on American soil is GlobalWafers' Sherman plant: Taiwanese capital, U.S. CHIPS Act money, Micron's own ten-year offtake. Ben Tessone, Micron's chief procurement officer, calls the bet securing "critical input materials." The phrase concedes the chokepoint. The honest counter is that GlobalFoundries runs 300mm wafers in Vermont — but as a foundry, not a raw-wafer producer, so the chokepoint does not move.

The mechanism repeats. "Made in America" memory, batteries, pharma precursors, rare-earth processing — each story ends at a single friendly-foreign-owned plant whose output the policy cannot substitute. This is where the structural critique lands: as long as one facility gates the chain, the policy buys capacity, not control. Sherman keeps the lights on; it does not put them in U.S. hands.