George Washington University: Jeffrey T. Richelson and Michael L. Evans' "Tiananmen Square, 1989: The Declassified History"
This article discusses the contentious relations between the U.S. and China after the crackdown by the Chinese army at Tiananmen Square in 1989.
Click http://nsarchive.gwu.edu/NSAEBB/NSAEBB16/ link to open resource.