 Beginning with Guangdong as a model state, he wanted to organize a "United States of China in the manner of the American experience" through negotiation with federalists from all parts of the country.The introduction of Special Economic Zones since the 1980s have led to the development of several distinct regional economies within the People's Republic of China, such as the Pearl River Delta, Yangtze River Delta, and the Bohai Circle.Several of these regions have economies the size of small developed nations.