As Trump heads to China, past US flubs on US policy toward Taiwan can be a warning

American presidents have navigated a verbal tightrope for nearly 50 years regarding official U.S. policy toward Taiwan and China. Carefully balanced to protect Taiwan’s security and sovereignty without promising too much but also not irking Beijing, the policy could again be pushed into the spotlight during President Donald Trump’s visit to China this week. The “One China” policy recognizes China's stance that Taiwan is part of China but allows informal U.S. relations with Taiwan. The policy is...