In 1860 the Democrat Party split in two allowing the Republican Party, which represented only the North of the country to gain control of the presidency. The South then declared itself an independent nation and began seizing military installations within its borders. This the North would not accept and war began.
The Civil War was the culmination of four decades of deep-seated economic, social, and political conflict:
These differences were serious, but could probably have been settled by negotiation but for one thing, the South's economy and social system were underpinned by chattel slavery.
There were over three-million black slaves south of the Mason-Dixon line, representing substantial percentage of the region's wealth. Even those who did not own slaves were prepared to support the system for fear of what would happen if it was dismantled.
| North | South | |
| Population | 22 million | 9 million including 3 million enslaved blacks |
| Size of army | 2.5 million men including 180,000 blacks | 1 million white males |
Hostilities commenced on April 12th, 1861, when Fort Sumter, in Charleston Harbor was fired upon by the Confederates and bombarded into submission. Lincoln then called for 75,000 volunteers to put down the 'insurrection'. It was the beginning of a bloody sectional conflict fought by citizen soldiers over mountains, through swamps, in tangled woodland and along the banks of broad rivers. Napoleonic formations were used, with troops advancing in close order against weapons that made such tactics a desperate undertaking.
In other respects the war encouraged many innovations: