it was the U.S embargo policy toward Ch

, It was the U.S shut the oos to China, and did not allow THE OTHER COUNTRIES OPEN theor doors to China!!!

Please read the recrods of U.D congress, from 1948 to 1979.
The U.S practically maintained the embargo policy to toward China even after 1979.


let me set teh record straight once more: It was Imperialsim " opium" trade forced China to close the ports of China to those pirates!!!