護国戦争
The National Protection War symbolized the beginning of the separation between the North and the South after the establishment of the Republic of China. Yuan Shikai was a legitimate president of the Republic, but his attempt to become Emperor was thwarted by the military opposition of the southern provinces. Even after the end of Yuan's short-lived monarchy, the Beiyang government in Beijing was no longer able to maintain control over the military leaders of the southern provinces. After the death of Yuan, the Beiyang government lost its leadership over warlords in the provinces and infighting among cliques within the government began in earnest; meanwhile, Sun Yat-sen of the Kuomintang created a military government in Guangzhou in the far south, leading to the protection of the Constitution.