American Revolution | 1776 to Treaty of Paris September 3, 1783

War of 1812 | Conflict between the U.S. and Great Britain from 1812 to 1815

Mexican War | Conflict between the U.S. and Mexico | 1846 to 1848

 American Civil War | April 12, 1861 and ended by proclamation on May 9, 1865

 Spanish-American War | April 21, 1898 to Paris Peace Treaty on December 10, 1898

 World War I aka the Great War | 1914 to 1918 | America enters the war 1917 | Armistice was November 11, 1918 | Treaty of Versailles outlines the terms in 1919

 World War II | Began in 1939 as a European conflict, but then widened to include most of the nations of the world | U.S. declares war on Japan, Germany, Bulgaria, Hungary, and Romania in December 1941 | War ends May 8, 1945