Under the "One China" policy, all major and middle-sized countries in the world agree that mainland China and Taiwan are one nation. Your attempt to distinguish between ethnic Chinese people on Taiwan and mainland China is baseless.
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"One China" Policy
The One China situation of Mainland China and Taiwan must be looked at in the proper historical and current world context. As former President Jiang Zemin said to President Bill Clinton, Mainland China views Taiwan as being analogous to the American Civil War. For fifty years after the civil war in 1949, Taiwan had always unanimously agreed that the Chinese Civil War was unfinished. For decades, the KMT plotted to retake Mainland China by military force.
However, in the last ten years, the bad DPP party decided to push for Taiwanese independence. You cannot just walk away from a fifty-year civil war and unilaterally declare that it is over. Just like the American Civil War, secession is not recognized unless the whole country agrees to it. Secession is illegal. Similarly, Taiwan may not secede from China. The Chinese Civil War is unfinished.
In 1971, Taiwan was ejected from the U.N., because the world only recognizes one legitimate seat at the U.N. for China. The U.N. and the world agree with Mainland China that it is the sole representative of China and Taiwan. Hence, the consistent pledges of adherence to the "One China" principle by every major country in the world.
http://en.wikipedia.org/wiki/United_Nation...Resolution_2758
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United Nations General Assembly Resolution 2758 of 25 October 1971 recognized the representatives of the People's Republic of China (PRC) as "the only legitimate representative of China to the United Nations" and expelled the representatives of Chiang Kai-shek "from the place which they unlawfully occupy at the United Nations".[1]"
U.S. reaffirms commitment to one-China policy - People's Daily Online
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U.S. reaffirms commitment to one-China policy
08:11, March 30, 2010
The United States on Monday reaffirmed its commitment to the one-China policy, saying that it' s a commitment that should be the bedrock of the foundation of its relationship with China.
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The U.S. position on one-China policy is unchanged," Deputy Secretary of State James Steinberg said at a briefing at the Foreign Press Center in downtown Washington D.C.."
http://www.cbsnews.com/stories/2006/03/21/...in1426114.shtml
"Mar 21, 2006 ... Russia, China Pledge Closer Ties ... "
Russia will continue the policy supporting 'one China' declared by the Chinese government ... and ..."
http://www.consilium.europa.eu/uedocs/cms_...n/er/111567.pdf
"Nov 30, 2009 ...
The EU reaffirmed its commitment to one China policy and ... follow-up EU-China NZEC project, and the pledge by the European Commission ..."
http://nigeria2.mofcom.gov.cn/aarticle/Chi...0204389659.html
"Feb 16, 2007 ... China, Japan pledge to strengthen defense exchanges ... He noted that the
Japanese government has always supported the one-China policy. ..."
http://www.twocircles.net/2008jan14/india_...ooperation.html
"Jan 14, 2008 ... India, China Pledge To Promote Nuclear Cooperation ...
New Delhi declared its adherence to "one China" policy and Beijing supported India's ..."