The ceramics import companies, primarily from Japan were an influential part of the American ceramic industry's history.Their work was often of high of quality, and many companies copied the designs of the American firms; therefore these manufacturers played an a big role in whether a domestic ceramic company survived or closed its doors.
Most pieces marked with the name of the country were made after 1891, when the McKinley Tariff Act was passed. Pieces from Japan were marked Nippon, the transliteration of the Japanese word for Japan. Around 1915, the words Made in... were usually added. In 1921, the United States required all imported goods to have country of origin names in English, so the word Japan replaced Nippon.
Items marked Made in Occupied Japan were produced from 1947 to 1952. After that, just the word Japan was used again.