Why is the Civil War referred to as the first modern war?

Question:

Why is the Civil War referred to as the first modern war?

Required reading:

Eric Foner, Give Me Liberty! An American History, Volume 1, Chapter 14

Abraham Lincoln's letter to Horace Greeley, 1862: http://www.abrahamlincolnonline.org/lincoln/speeches/greeley.htm (Links to an external site.)Links to an external site.

Frederick Douglass urges black men to join the war, 1863: http://www.blackpast.org/1863-frederick-douglass-men-color-arms (Links to an external site.)Links to an external site.

DeBow's Review article urging non-slaveholders to fight for the Confederacy, 1861: http://www.ucs.louisiana.edu/~ras2777/amgov/debow.htm (Links to an external site.)Links to an external site.

Eye-witness account of the Richmond bread riots of 1863: http://www.eyewitnesstohistory.com/breadriot.htm (Links to an external site.)Links to an external site.

Instruction:

Must be 2 pages (double-space)

Answer the question thoroughly by reading all requirement.

All the required reading MUST be CITED in Chicago format.