Answer:
C: preserve the Union
Step-by-step explanation:
In 1861, the North went to war to preserve the Union and abolish slavery in the South. The aggression between the North and the South began during the election of 1860. Abraham Lincoln examined and denied the expansion of slavery in the territories. His election disrupted the two sides. Lincoln wanted to unite all the states, but the Southern states chose to form a separate government by creating the Confederate States of America. The Civil War became necessary to preserve the nation with the ideas of the founding fathers.