The first shot of the American Revolution on Lexington Green in the Battle of Lexington and Concord is referred to as the “shot heard ‘round the world.” The American Revolution not only established the United States, but also ended an age (an age of monarchy) and began a new age (an age of freedom). It inspired revolutions around the world. The United States has the world’s oldest written constitution, and the constitutions of other free countries often bear a striking resemblance to the US Constitution – often word-for-word in places. As a result of the growing wave started by the Revolution, today, people in 144 countries (representing 2/3 of the world’s population) live in full or partial freedom.