In so far as the foreign trade of the Indian sub-continent is concerned, the aspirations and the activities of the Estado da India represented several institutional innovations. As a result of the Portuguese naval watch, at the end of the sixteenth century few Indian ships could venture to east Africa, the Spice Islands, or to China and Japan unless, the shipowners entered into indirect partnerships with Portuguese officials or merchants in Goa. Both the coast of Coromandel and the Gujarat plains in western India produced a wide variety of patterned cotton fabrics which found specialized markets in the islands of south-east Asia. During the eighteenth century, India's foreign trade underwent a considerable expansion as a result of the tripartite participation of the Dutch, English, and the French. It is inconceivable that European trade with India, in general for that matter, could have been sustained on a large scale for any length of time without the discovery of American silver-mines.