When he was a little boy in the 1980s, Wang Xiaojun was taught to be proud of his home town of Lüliang in the north-western Chinese province of Shanxi. Shanxi is China’s biggest coal-producing region, and Lüliang was a significant base for the army during the second world war. Nestled in the mountains of the dusty Loess Plateau, Lüliang, a city of 3.4 million people, has had less to shout about in recent years. A series of corruption scandals in the city brought down several high profile officials shortly after…