the Civil War
In 1619 the first slave arrived in the Americas. For the next 250 years, slavery caused problems all over the country. Southern states were dependent on slave labor and brought in slaves by the millions. The northern states worked at limiting slavery in new states and abolishing slavery in the country. The more states that were added, the bigger the problem became. In 1861, after the election of Abraham Lincoln, nine states seceded from the union and the civil war began. Four years and over 600,000 casualties later, the war was over and slavery was abolished in the United States. After the war, Americans started considering themselves Americans instead of people from certain states. In some ways we are still recovering from the Civil War.