The major significance of the American Revolution in world history was its establishment of the United States as an independent nation and the introduction of democratic ideals that influenced global movements for freedom. Initiated in 1775 and culminating in 1783, the revolution challenged traditional monarchical rule and demonstrated that colonies could successfully overthrow an imperial power. The principles of liberty, equality, and self-governance articulated in the Declaration of Independence inspired later revolutions, including the French Revolution and independence movements across Latin America. The American Revolution set a precedent for constitutional governance, establishing a model for future democratic societies.