Revolutionary War: The Revolutionary War was a major conflict fought between Great Britain and the American colonies, resulting in the independence of the United States.
Civil War: The Civil War was a major conflict fought between the Union states and Confederate states, leading to the abolition of slavery and reunification of the country.
World War II: World War II was a major global conflict involving many countries, including the United States, which brought about significant social changes such as increased women's rights and racial integration.