NEW YORK – To anyone over the age of 60 who follows world affairs, the term “two Chinas” recalls the post-1949 competition for diplomatic recognition waged by mainland (“Red”) China and Taiwan, or, more formally, the People’s Republic of China and the Republic of China. By the early 1970s, just about every country fell in line with the People’s Republic’s demand that it alone be recognized as the legitimate sovereign government of China.