Large-scale Chinese immigration to California began around the time of which 1849 event?

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? Which ancient Chinese text, the "Book of Changes", is based on 64 six-line symbols called hexagrams? 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? Chisago and Itasca are counties in which state?