South Carolina seceded from the Union after the announcement of Lincoln winning the 1860 election.
South Carolina believed Lincoln as president was dire and seceded from the Union first. South Carolina took Fort Sumter being within their border. Lincoln viewed this as a hostile action and would be considered the first battle of the Civil War.
Visible light is the small part within the electromagnetic spectrum that human eyes are sensitive to and can detect. Visible light waves consist of different wavelengths.
The African Americans helped out the war majorly throughout that time period. They participated in protest marches and also tried to join the forces with blacks to fight for freedom.