Since President Nixon's historic trip to China in 1972—the first ever for a sitting president—visits by leaders of the two countries have become more frequent. President George W. Bush went to China four times during his presidency and President Obama went to China before his first year in office was over. The current visit by China's President
Hu Jintao marks the ninth visit to the United States by a
Chinese head of state.
PHOTOS: AFP/Getty Images; David Hume Kennerly/White House Photograph Courtesy Gerald R. Ford Library; White House Photograph Courtesy Jimmy Carter Library; White House Photograph Courtesy Ronald Reagan Presidential Foundation and Library; Luke Frazza/AFP/Getty Images; Mandel Ngan/AFP/Getty Images; Saul Loeb/AFP/Getty Images
SOURCES: Public Papers of the President; State Department