China’s new national map has set off a wave of protests. Why?

China has upset many countries in the Asia-Pacific region with its release of a new official map that lays claim to most of the South China Sea, as well as to contested parts of India and Russia, and official objections continue to mount. China's Ministry of Natural Resources released the new “standard” national map on Monday, part of what it has called an ongoing effort to eliminate “problem maps.” In it, China clearly shows its so-called nine-dash line, demarcating what it considers its maritime border, claiming almost the entirety of the South China Sea.