The event often referred to as "the shot heard 'round the world" marks the beginning of the American Revolutionary War, specifically the battles of Lexington and Concord on April 19, 1775. This phrase signifies the first gunfire between British troops and colonial militia, symbolizing the start of the conflict for American independence. The skirmishes showcased the colonists' willingness to fight for their rights and liberties against British oppression. The phrase captures the momentous impact of this confrontation, galvanizing support for the revolutionary cause and ultimately leading to the creation of the United States.