1. The Northern Expedition led by the Guomindang armies took control of major cities in China from 1926-1927 but faced resistance from warlords and could not establish full control over the country.
2. In 1927, the Guomindang turned on their Communist allies and massacred them in Shanghai and other cities, forcing the Communists to retreat to rural bases like the Jiangxi Soviet.
3. While the Guomindang nominally unified northern China by 1928 with the help of warlords, real control was limited as warlords still held power in their own territories and the Communists grew stronger in the countryside, gaining peasant support through land reforms. The Guomindang struggled to establish authority