Wars from the Revolutionary War to now By Tmayer Apr 19, 1775 Revolutionary War 1775 - 1783 Jun 18, 1812 War of 1812 1812 - 1815 Oct 2, 1835 War for Texas Independence 1835 - 1836 Between Texas and Mexico Apr 12, 1861 U.S. Civil War 1861 - 1865 Between the North and the South Apr 25, 1898 Spanish-American War 1898 Between Spain and the U.S.