Ivory was used for false teeth until porcelain came into use for that purpose in the latter part of the nineteenth century. It was the common material for making buttons and clasps, although rivalled more and more by vegetable ivory and casein from milk. In the United States a demand came with the rapid increase in population, and ivory was used for piano and organ keys, musical instruments, billiard and bagatelle balls, not to mention the ivory inlaid butts of six-shooters for the American west. America was the market for 80 % of the soft ivory exported from Zanzibar in

his participation grew out of differing beliefs about the power of trade to bring about economic, social and political change.