Which ancient Chinese text, the "Book of Changes", is based on 64 six-line symbols called hexagrams?

The Great Wall failed to keep out which Mongol conqueror, who invaded northern China in the early 1200s? Chinese-born actress Joan Chen played the wife of emperor Pu Yi in which Oscar-winning 1987 epic? Which urban area lies opposite Hong Kong Island across Victoria Harbour? Chinese admiral Zheng He visited Calicut, India, decades before which Portuguese explorer reached it in 1498? Large-scale Chinese immigration to California began around the time of which 1849 event? In which decade did China's Nationalist government flee to Taiwan? Chipotles are dried, smoked versions of which chili pepper? Chiricahua and Mescalero are dialects of which Native American language?