 Complete the following phrase:  Towards the end of the Northern Expedition, the KMT government in Nanjing began to be recognized by foreign powers as the legitimate government of China. However, this led to a weakening of the Chinese military presence and position in Manchuria. Zhang Xueliang, succeeding his father, Zhang Zuolin, made a decision to negotiate with KMT leaders in Nanjing for recognition. Nanjing decided, however, that the NPA would be fully disbanded, leading to the Northeast Flag Replacement. In its place, local warlords began to dominate Manchuria; the people of the northeastern provinces suffered from increasing societal disorder, and Chinese authority collapsed in the region, paving the way for the 