When people believed the region would observe more cooperation and less fights, the second decade raised the curtain of re-emergent South China Sea territorial disputes. While majority of the academic works were concentrating on the resolutions for the South China Sea territorial disputes, this thesis is taking the track of searching for the motivations of the re-emergence of territorial disputes. To make things straight, the thesis works specifically on the strategies that the U. Why the U. The thesis first performed explanation on the territorial disputes with a theoretical approach and proposed that the competition between two big powers could lead to territorial disputes. The subsequent chapter reviewed past academic literature on the South China Sea territorial disputes and pointed out the lack of researches into roots of the territorial disputes.