The 'Boston Massacre,' which occurred on March 5, 1770, is remembered as a tragic event where British soldiers shot and killed several colonists protesting against British oppression in Boston. This incident fueled anti-British sentiments and became a rallying point for revolutionaries advocating for independence. The event was portrayed as a symbol of British tyranny and played a crucial role in galvanizing public opinion, leading to further protests and the eventual outbreak of the American Revolution.