An act to discontinue, in such manner, and for or such time as are therein mentioned, the landing and discharging, lading or shipping, of goods, wares, and merchandise, at the town, and within the harbour, of Boston, in the province of Massachusetts's Bay, in North America. —Boston Port Bill, 1774

What was the purpose of this act?

to discontinue the trade of merchandise within the city of Boston
to close Boston Harbor
to close ports throughout Massachusetts Bay
to decrease trade with the North American colonies