The beads also became an issue in New England of the 1630s. The Dutch traders had discovered the value placed on wampum, both accepting and distributing it as a curency at their trading stations. The Pequots used their dominance of tribes around Long Island Sound to gain control of the sources of the beads, at least until the English in Massachusetts also learned of its value. Settlers in the Massachusetts Bay Colony began to manufacture wampum, and the use of rasps and steel drills greatly reduced the labor needed. The resulting decrease in wampum's trade value became one of the issues that led to the Pequot War.