 Complete the following phrase:  From 1917 to 1928, much of Amdo was occupied intermittently by the Hui Muslim warlords of the Ma clique. In 1928, the Ma Clique joined the Kuomintang Chinese Nationalist Party, and during the period from 1928 to 1949, much of Amdo was gradually assimilated into the Qinghai province and part of Gansu province of the Kuomintang Republic of China. By 1952, Communist Party of China forces had defeated both the Kuomintang and the Tibetan forces and had assumed control of the region, solidifying their hold on the area roughly by 1958. Tibetan guerilla forces in Amdo emerged in 1956 and continued operating through the 