<P> During the American Civil War (1861--1865), the Union referred to the United States of America and specifically to the national government of President Abraham Lincoln and the 20 free states, 4 border and slave states (some with split governments and troops sent both north and south) that supported it . The Union was opposed by 11 southern slave states (or 13, according to the Southern view and one western territory) that formed the Confederate States of America, or also known as "the Confederacy". </P> <P> All of the Union's states provided soldiers for the United States Army (also known as the Union Army), though the border areas also sent tens of thousands of soldiers south into the Confederacy . The Border states were essential as a supply base for the Union invasion of the Confederacy, and Lincoln realized he could not win the war without control of them, especially Maryland, which lay north of the national capital of Washington, D.C. . The Northeast and upper Midwest provided the industrial resources for a mechanized war producing large quantities of munitions and supplies, as well as financing for the war . The Midwest provided soldiers, food, horses, financial support, and training camps . Army hospitals were set up across the Union . Most states had Republican Party governors who energetically supported the war effort and suppressed anti-war subversion in 1863--64 . The Democratic Party strongly supported the war at the beginning in 1861 but by 1862, was split between the War Democrats and the anti-war element led by the "Copperheads". The Democrats made major electoral gains in 1862 in state elections, most notably in New York . They lost ground in 1863, especially in Ohio . In 1864, the Republicans campaigned under the National Union Party banner, which attracted many War Democrats and soldiers and scored a landslide victory for Lincoln and his entire ticket against opposition candidate George B. McClellan, former General - in - Chief of the Union Army and its eastern Army of the Potomac . </P> <P> The war years were quite prosperous except where serious fighting and guerrilla warfare took place along the southern border . Prosperity was stimulated by heavy government spending and the creation of an entirely new national banking system . The Union states invested a great deal of money and effort in organizing psychological and social support for soldiers' wives, widows, and orphans, and for the soldiers themselves . Most soldiers were volunteers, although after 1862 many volunteered in order to escape the draft and to take advantage of generous cash bounties on offer from states and localities . Draft resistance was notable in some larger cities, especially New York City with its massive anti-draft riots of July 1863 and in some remote districts such as the coal mining areas of Pennsylvania . </P>

Who won reconstruction the union or the confederacy