Why the fuss? The US, Taiwan and China -- a guide

Why has the announcement by the United States of its highest-level visit to Taiwan for four decades sparked such anger from Beijing?Here is a recap of the key issues surrounding the delicate relations between the US, China and Taiwan.The deep rift between China and Taiwan dates back to China's civil war, which erupted in 1927 and pitted forces aligned with the Communist Party of China against the Nationalist Kuomintang (KMT) army.