NPR: The sudden change was precipitated because of Chinese displeasure over one document that the U.S. had planned to show: the Treaty of San Francisco of 1951, according to the diplomat and two other people familiar with the matter granted anonymity because they were not authorized to speak publicly.
Beijing was irate over the Treaty of San Francisco “because the U.S. and Japan signed it, but not China,” according to one of the Chinese diplomats…