school history textbooks to abolish the "remnants of greater Chinese consciousness" (). This textbook's de-Sinicization included the separation of Taiwanese history and Chinese history into separate volumes, a ban on the term mainland China, and the portrayal of Chinese immigration to Taiwan during the Qing dynasty as "colonization". Concurrently, Chen introduced the One Country on Each Side concept in 2002, which posited that China and Taiwan are separate countries, while ordering the addition of the words "Issued in Taiwan" on Republic of China passports. That same year, Tu's department chose to invent its own romanization system for Mandarin Chinese, Tongyong Pinyin, designed by a Taiwanese scholar rather than adopting the internationally well-known Hanyu Pinyin system developed by the People's Republic of China and used in other countries such as Singapore and Malaysia. In 2003, the government abolished the longstanding policy of using Mandarin as the sole language of government, which in practice promoted the second-largest language on the island, Taiwanese Hokkien, to fulfill many of the functions of a national language. From 2004, the map of the "Republic of China" no longer includes mainland China. From 2005, Chen's Executive Yuan also initiated the Taiwan Name Rectification Campaign, which sought to remove the words "China" or "Chinese" from public and private organizations. This included the renaming of state bodies such as the "Overseas Chinese Affairs Council" (which became the "Overseas Community Affairs Council"), persuading private organizations like China Airlines to change their name, and also the purging of references to mainland China in nearly 100 administrative laws. In 2006, Chen abolished the National Unification Council and its Guidelines for National Unification. In February 2007, Chen's government changed the name of Chunghwa Post (China Post) to Taiwan Post, Chinese Petroleum Company to "CPC Corporation, Taiwan, and China Shipbuilding Corporation to "CSBC Corporation, Taiwan". The name changing issue was a topic in the Republic of China presidential elections in Taiwan in March 2008. Former Taipei mayor Ma Ying-Jeou was elected as the President, whereupon he sought to reverse some of the de-Sinicization policies of Chen. On 1 August 2008, the postal service resolved to reverse the name change and restore the name "Chunghwa Post". As of 1 January 2009, Tongyong Pinyin was abolished by the government in favor of Hanyu Pinyin. On September 28, 2009, Ma celebrated the 2559th birthday of Confucius at the Taiwan Confucian Temple, which was built in 1665. And