When did Qinghai become a province of China?

Qinghai was officially established as a province of China in 1928.1

Prior to this designation, the region had a long history of shifting administrative status. It was placed under a separate administration in 1724 by the Qing dynasty, following increased Chinese political and cultural influence in the area. Before the 20th century, the region—often referred to as Amdo—was historically associated with Tibet and was governed by various local powers, including the Tuyuhun state and Mongol rulers, before being integrated into the broader Chinese administrative framework.1