To whom did lincoln had wage war? .
a. the south.
b. the west.
c. the union

A. The Union.
The Union, because after the South [Union], didn't like how Abe was going to make laws freeing the slaves, so the South thought they were going to lose their power because slaves were their major roll ecomonmically, so they saw as there opportunity to revolt and seceded from the United States of America to make the Confederate States of America.

President Lincoln waged war on the South. The Southern states that went to the Civil War withdrew from the Union. The correct answer is A.