Because when Chiang Kai Shek took Taiwan he was upset that China got a veto vote in the UN and refused to join the UN on that notion. He believed he was the rightful ruler of China. From then on China didn’t alow Taiwan into the UN with the use of their Veto power.
”Taiwan's official name is REPUBLIC of CHINA.”
You seem to only read what is coming out of China don’t you? Show me where it says Taiwan’s official name? Tell me what it says would you please?
http://www.cia.gov/cia/publications/factbook/geos/tw.html
Excuse me but why am I teaching you stuff that is so basic when you state I know nothing?
http://www.gio.gov.tw/
See that? It says, REPUBLIC OF CHINA :^)
Duh. Taiwan's official name IS REPUBLIC OF CHINA. One issue that will lead up to indepdence if it changes it to TAIWAN, then it's basically declaring independence.
Cia Factbook, that's a contradictory in terms :)