China in 2011 saw significant political and social events, including: 1) President Hu Jintao visited the U.S. while Vice President Biden visited China. 2) China showed support for victims of Japan's earthquake and supported North Korea after Kim Jong-il's death. 3) The Chinese government cracked down on dissent around the Jasmine Revolution and detained Ai Weiwei, while censorship of charities and environmental protests increased.