Compléter AMERICAN CIVIL WARVersion en ligne A brief explanation of American Civil war using key vocabulary. par Alfonso Poza 1 deadliest surrender injured 1861 rights secede southern Lincoln slavery ruin Confederate The Civil War in the United States began in , after decades of tensions between northern and states over , states' and westward expansion . The election of Abraham in 1860 caused seven southern states to and form the States of America ; four more states soon joined them . The War Between the States , as the Civil War was also known , ended in Confederate in 1865 . The conflict was the war ever fought on American soil , with some 620 , 000 of 2 . 4 million soldiers killed , millions more and much of the South left in .