On this day 250 years ago in London, the British Prime Minister Lord North introduced in Parliament a bill to close the Port of Boston to all shipping as punishment for the Boston Tea Party.

Source: https://www.americanhistorycentral.com/entries/boston-port-act-facts/#:~:text=March%2018%2C%201774%20—%20Lord%20North,to%20the%20House%20of%20Commons.