対華21カ条要求
The first boycott of Japanese products in China was started 1915 as a result of public indignation at the Twenty-One Demands which Japan forced China to accept. In 1919, the students and intellectuals involved in the May Fourth Movement called for another boycott of Japanese products, to which the public responded enthusiastically. Local chambers of commerce decided to sever economic ties with Japan, workers refused to work in Japanese-funded factories, consumers refused to buy Japanese goods, and students mobilised to punish those found selling, buying or using Japanese products.