From the earliest years of the 17th century, the Dutch were engaged in the fur trade on the Hudson River. In 1614, they established trading posts on Manhattan Island and at Fort Orange (present-day Albany, New York). But only after the American Revolution (1775-1783) did Dutch immigration to British North America (now Canada) begin. The Dutch who had long been settled in the Thirteen Colonies fit easily into Canadian society. Since that time, Canada has experienced three waves of immigration from the Netherlands, the largest of them after the Second World War.