Final answer:
The "shot heard round the world" refers to the events of April 19, 1775, in Lexington, Massachusetts, which marked the beginning of the American Revolution.
Step-by-step explanation:
The incident described in the question refers to the events that took place on April 19, 1775, in Lexington, Massachusetts, marking the beginning of the American Revolution. On that day, a confrontation occurred between British troops and colonial militia at Lexington Green. It is commonly referred to as the "shot heard round the world" because it ignited the revolutionary spirit not only in America but also inspired other countries, such as France, to fight for their own independence.