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

Diplomats, world leaders and China watchers were stunned when President-elect Donald Trump spoke by phone with Taiwanese leader Tsai Ing-wen, breaking with decades of tradition. Here are the key issues surrounding the delicate relations between the United States, 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.