What was one of the most formative events in American history?

One of the most formative events in American history was the American Revolution (1775-1783). This conflict not only resulted in the colonies gaining independence from British rule but also laid the groundwork for the establishment of democratic principles and the Constitution. The Revolution inspired subsequent movements for freedom and self-governance around the world, fundamentally shaping the identity and values of the United States. Its legacy continues to influence American politics and society today.