 Silk remained the center of Franco-Japanese economic relations until the First World War.As of 1875, Lyon had become the world center for silk processing, and Yokohama had become the center for the supply of the raw material.Around 1870, Japan produced about 8.000 tons of silk, with Lyon absorbing half of this production, and 13.000 tons in 1910, becoming the first world producer of silk, although the United States had overtaken France as the first importer of Japanese silk from around 1885.