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The American Revolutionary War, sometimes known as the American War for Independence, was a war fought between Great Britain and the original 13 colonies, from 1775 to 1783. Caused by colonial resentment of British taxes and strict, impractical rules and regulations, it eventually led to the development of the United States as an independent nation. Fought from 1861 to 1865, the American Civil War was a war between the Union (almost all northern and western states) and the Confederate States of America (almost all southern states), primarily over the practice of slavery. To date, the Civil War remains the deadliest conflict in U.S. history.