Boston Port Bill goes into effect.

The law closes the Port of Boston to international trade until the East India Company and customs office are reimbursed for losses resulting from the Boston Tea Party, makes Marblehead the port of entry, and makes Salem the seat of government, which requires the General Court to meet there. As church bells toll in mourning, the Fourth and Forty-Third British Regiments land in Boston to enforce the law. Henceforth, no ships are allowed to enter the harbor, and the 500 ships that had been based in Boston Harbor must find other ports from which to sail by June 15, 1774.