Which act in 1774 closed the port of Boston?

The Boston Port Act closed the port of Boston in 1774. Parliament passed the act on March 31, and it took effect on June 1, following the Boston Tea Party of December 1773.

The law prohibited ships from loading or unloading goods in Boston Harbor until the East India Company had been compensated for the tea destroyed during the protest. It also allowed customs officials to move to Salem and made Marblehead the main port of entry for the area.

The act was one of the Coercive Acts, called the Intolerable Acts by many American colonists. The punishment affected merchants, dockworkers, sailors, and ordinary residents, helping turn opposition to British taxation into broader resistance to imperial rule.

The Quartering Act concerned housing British troops, while the Tea Act regulated tea sales and the Stamp Act imposed duties on printed materials. None of those acts closed Boston Harbor.