flexible definition suggesting that both mainland China and Taiwan are parts that form one cultural and geographic entity, although divided politically as a vestige of the Chinese Civil War. The PRC considers itself the sole legitimate government of all China, and the ROC to be a defunct entity replaced in the Communist revolution that succeeded in 1949. Therefore, assertions that the ROC is a sovereign state are construed as support for Taiwan independence, so are proposals to change the name of the ROC. Such a name change is met with even more disapproval since it rejects Taiwan as part of the greater China entity (as one side of a still-unresolved Chinese civil war). The ROC used to be recognized by the UN as the sole legal government of China until 1971. In that year, the UN Resolution 2758 was passed, and the PRC became recognized as the legal government of China by the UN. During PRC President Hu Jintao's visit to the United States on 20 April 2006, U.S. President George W. Bush reaffirmed to the world that the U.S. would uphold its One-China policy. Chinese nationalists have called the Taiwan independence movement and its supporters to be hanjian (traitors). Opinion polls In an opinion poll conducted in Taiwan by the Mainland Affairs Council in 2019, 27.7% of respondents supported Taiwan's independence: 21.7% said that the status quo has to be maintained for now but Taiwan should become independent in the future, while 6% said that independence must be declared as soon as possible. 31% of respondents supported the current situation as it is, and 10.3% agreed to unification with the mainland with 1.4% saying that it should happen as soon as possible. Several polls have indicated an increase in support of Taiwanese independence in the three decades after 1990. In a Taiwanese Public Opinion Foundation poll conducted in June 2020, 54% of respondents supported de jure independence for Taiwan, 23.4% preferred maintaining the status quo, 12.5% favored unification with China, and 10% did not hold any particular view on the matter. This represented the highest level of support for Taiwanese independence since the survey was first conducted in 1991. A later TPOF poll in 2022 showed similar results. The Election Study Center, NCCU Taiwan Independence vs. Unification with the Mainland Survey shows a steady increase in respondents choosing "maintain the status quo and move toward independence in the future"