Colours and States

Confederate Forces
Uniform Colour: Grey
Confederate States: South Carolina, Mississippi, Florida, Alabama, Georgia, Louisiana, Texas, Virginia, Arkansas, Tenessee, North Carolina
Number in Army of those who Served During the American Civil War: 1,200,000
Casualties: 340,000
Fatalities: 250,000

Union Forces
Uniform Colour: Blue
Union States: Oregon, California, Kansas, Minnesota, Iowa, Wisconsin, Illinois, Indiana, Michegan, Ohio, Pennyslvania, New York, New Jersey, Vermont, New Hamprshire, Connecticut, Rhode Island, Massachusetts, Maine
  Still Under Slavery: Missouri, Kentucky, West Virginia, Delaware, Maryland
  Territories: Washington, Dakota, Nebraska, Colorado, Indian (Oklahoma), New Mexico (Arizona),  Nevada, Utah
Number in Army of those who Served During the American Civil War: 2,900,000
Casualties: 340,000
Fatalities: 250,000

Sources: http://www.pbs.org/civilwar/war/map1.html#; http://www.thelists.org/list-of-union-states.html