The United States issued a issued a statement of “U.S. Position on Maritime Claims in the South China Sea” (the Statement hereafter) on July 13, 2020, definitely denying China's claims to the South China Sea, which runs completely contrary to the attitude of taking no position on the sovereign disputes over the South China Sea manifested in relevant statements made during the Clinton and Obama administrations of the United States, thus putting the US in opposition to China's claims over the South China Sea. The Statement is not only in line with the tough policy on China pursued by Obama during his late administration over the South China Sea issue, but also assumes more characteristics of power-politics on top of Trump's indulgence of the US military to get tough with China since his coming to office. Its inherent power-politics logic highlighting American absolute dominance over Asian affairs indicates that the objective conditions for the US to pursue an extreme policy on the South China Sea have become mature, while the manifestation of extremism in such a policy is likely to get more apparent.