- The American Chamber of Commerce in Japan (ACCJ) was established in 1948 as a means to further develop commerce between the United States of America and Japan, promote the interests of U.S. companies and members, and improve the international business environment in Japan.The ACCJ is a non-profit membership organization run by and for its members. Today the ACCJ has offices in Tokyo, Osaka, and Nagoya, and represents approximately 3,500 members from over 1,000 companies and 40 countries.