In the days of colonization, both people in the North and people in the South kept slaves. Little by little the northern States became industrialized and slavery was gradually abolished.
The South, on the contrary, remained essentially rural, and the landowners, who needed slaves to cultivate the land and chiefly to produce cotton, didn’t want to abolish slavery.
In 1860 Abraham Lincoln became the sixteenth President of the United States of America. He was a well-known lawyer who had always fought against slavery and so it happened that the southern States, which needed negro slaves, withdrew from the Union and elected their own President, Jefferson Davis.
Civil war was inevitable and, in fact, it broke out a few months later, and lasted four years. In the end the southern commander, General Lee, had to surrender to the northern General Grant.
In this war thousands of soldiers died and a great number of houses and farms were set on fire chiefly in the South. But slavery was abolished at last.