So here you may ask yourself another question: Although many things changed after the victory of the Communist the tradition of arranged marriages more or less continued, especially in rural areas. Also, their looks are different than the women from those countries. Asian children enjoy less freedom than European or American ones. They have zero financial motivation for meeting a nice North American or European guy. You are expecting me to explain that this is an urban legend and that there is really a huge surplus of Chinese ladies.
It was cultural bias.
The communist ethos was that it is the duty of every citizen to maximize their natural talents to forward the power, welfare, and reputation of the Communist Party, the Chinese people, their families, and themselves more or less in that order. First, the distribution of men and women in China is uneven. Start looking for your Asian love right now. China is often not even on the list of places that men consider when they begin thinking about Asian ladies and there are a lot of good reasons for that. They pay a lot of attention to look after their shape, do sports and lead an active lifestyle.