Major political revolutions reshaped the world from the late 18th to mid-19th centuries. The American, French, Haitian, and Latin American revolutions challenged existing power structures, inspired by Enlightenment ideals of liberty, equality, and self-governance. These upheavals led to new political systems, social changes, and economic shifts. They sparked the rise of nationalism, republicanism, and new ideologies like socialism. The revolutions' impact extended globally, influencing future movements for independence, rights, and political reform.