The technology relationship between the United States and China did not break in a single moment. It eroded through a decade of escalating restrictions, retaliatory measures, investment screenings, and legislative maneuvers — each move accelerating the next. What began as targeted actions against individual companies has become a structural reorganization of the global technology supply chain. This timeline documents that process from its earliest institutional signals through the present. 2015 January — The Obama administration’s Department of Commerce adds CETC (China Electronics Technology Group Corporation), a state-owned defense electronics conglomerate, to the Entity List, citing its role in supplying military electronics.