In 1767, the Parliament passed the Townshend Acts which placed duties on a number of essential goods, including paper, glass, and tea, and established a Board of Customs in Boston to more rigorously execute trade regulations. The new taxes were enacted on the belief that Americans only objected to internal taxes and not to external taxes such as custom duties. The Americans, however, argued against the constitutionality of the act because its purpose was to raise revenue and not regulate trade. Colonists responded by organizing new boycotts of British goods. These boycotts were less effective, however, as the Townshend goods were widely used.