The American Civil War, 1861–1865, resulted from long-standing sectional differences and questions not fully resolved when the United States Constitution was ratified in 1789. With the defeat of the Southern Confederacy and the subsequent passage of the XIII, XIV and XV amendments to the Constitution, the Civil War’s lasting effects include abolishing the institution of slavery in America and firmly redefining the United States as a single, indivisible nation rather than a loosely bound collection of independent states. It was a war that saw many "firsts." The long list of Civil War firsts include America’s first income tax, the first battle between ironclad ships, the first extensive use of black soldiers and sailors in U.S. service, the first use of quinine to treat typhoid fever, America’s first military draft, and many others. There were advances in medical treatment, military tactics, the chaplain service, and other fields. Over the course of the Civil War weapons ranged from obsolete flintlocks to state-of-the-art repeaters. During the Civil War, women took on new roles, including running farms and plantations and spying; some disguised themselves as men and fought in battle. All of the nation’s ethnic groups participated in the war, including Irish, Germans, American Indians, Jews, Chinese, Hispanics, etc. Northerners have also called the Civil War the War to Preserve the Union, the War of the Rebellion (War of the Southern Rebellion), and the War to Make Men Free. Southerners may refer to it as the War Between the States or the War of Northern Aggression. In the decades following the conflict, those who did not wish to upset adherents of either side simply called it The Late Unpleasantness. It is also known as Mr. Lincoln’s War and, less commonly, as Mr. Davis’ War
Most naval actions occurred on rivers and inlets or in harbors, and include history’s first clash between two ironclads, the USS Monitor and CSS Virginia (a