After Confederates fired on citadel Sumter in mid-April 1861, Lincoln’s call for 75,000 volunteers to suppress the riot brought on 4 slave states of the upper South, inclusive of Virginia, to join their Deep South brethren. 4 different slave states, normally referred to as the Border States, remained dependable to the Union.
Each facets mobilized on a scale unprecedented in American history. Drawing on an 1860 population of just greater than one million army-age white males, the Confederacy positioned among 800,000 and 900,000 guys in uniform (fragmentary data do now not permit a unique matter). The us mustered as a minimum 2.1 million men, about half of its 1860 army-age populace. More than a hundred and eighty,000 African American guys served in america military devices and some other 20,000 within the military. Other than its lots larger populace, america held determined advantages in industrial capability, business pastimes, and economic infrastructure.