<Li> 1899--1902 Philippine--American War </Li> <Li> 1899--1913 Moro Rebellion </Li> <Ul> <Li> 1913 - 1914 Colorado Coalfield War </Li> <Li> 1914--1918 World War I <Ul> <Li> 1914 A Japanese fleet captures the Mariana Islands from Germany without any loss of life . This is notable as the only land action fought during World War I that took place on what is now U.S. soil (Guam and the Northern Mariana Islands). </Li> <Li> 1917 The U.S. enters the war . </Li> <Li> 1918 German submarine SM U-156 attacks the port of Orleans, Massachusetts on July 21, sinking several small vessels, in an action which became known as the Bombardment of Orleans . </Li> </Ul> </Li> <Li> 1915 Bandit War </Li> <Li> 1916 Mexican revolutionary Pancho Villa leads a night raid on the New Mexico border town of Columbus . </Li> <Li> 1921 Battle of Blair Mountain </Li> <Li> 1941--1945 World War II <Ul> <Li> 1941 Japanese surprise attack on American naval base at Pearl Harbor, Hawaii . </Li> <Li> 1942 Bombardment of Fort Stevens, Oregon by Japanese submarine I - 25 </Li> <Li> 1942 The Lookout Air Raids by a floatplane from Japanese submarine I - 25; incendiary bombs were dropped but did not start a forest fire in Oregon </Li> <Li> 1941--1945 Mostly during a period known as the "Second Happy Time", numerous American warships and merchant vessels sunk in American territorial waters by German U-boats . </Li> <Li> 1942--1943 World War II Battle of the Aleutian Islands in Alaska . </Li> <Li> 1944--1945 Fire balloon bombing of the US by Japanese balloon bombs: six civilians killed, minor damage inflicted . </Li> </Ul> </Li> </Ul> <Li> 1913 - 1914 Colorado Coalfield War </Li>

When was the last time a war was fought on american soil