The Roman Catholic Church in the 20th century had to respond to the challenge of increasing secularization of Western society and persecution resulting from great social unrest and revolutions in several countries. It instituted many reforms, particularly in the 1970s under the Vatican II Council, in order to modernize practices and positions. In this period, Catholic missionaries in the Far East worked to improve education and health care, while evangelizing peoples and attracting numerous followers in China, Taiwan, Korea, and Japan.