What causes alliances to split between the People's Republic of China (PRC) and its allies and how can this information be used to predict Beijing's relationship with North Korea. Since its founding in 1949, the PRC has become engaged in several alliances, formal and informal; however, the majority of these friendships fell to the wayside. The Soviet Union, Mongolia, and North Vietnam all gained and lost China as an ally. This thesis identifies which factors led to the deterioration and splitting of these alliances. It argues that factors concerning national sovereignty have a heavy significance when combined with the involvement of a competitive power. The explanations for the collapse of these historical alliances provide critical insight into China's current friendship with North Korea. This thesis shows that the conditions that led to alliance splits in the historical cases are not present in the current relationship with North Korea. It then concludes that the Sino-North Korean alliance will remain viable for the foreseeable future.
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