What U.S. legislation largely restricted NASA cooperation, necessitating China's independent station development?
Answer
Wolf Amendment
China's decision to build its own long-duration crewed orbital research facility was heavily influenced by political realities, specifically the U.S. Wolf Amendment. This legislation imposes strict limitations on cooperation between NASA and any entity tied to the Chinese military. Because this political barrier prevented China's participation in the established International Space Station (ISS) program, constructing the Tiangong station independently became the sole viable pathway for achieving sustained human presence in orbit.

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