Whether the cost of the Civil War worth the outcome of the war depends on your beliefs and values.I believe it's worth the outcome because after the Civil War the slaves were emancipated (freed),and the United States was no longer divided as the North and the Confederacy.However,the Civil War resulted in the death of 1,030,000 people.Hence it depends on which you value more,life or freedom.
Here are the results of the war:
Slavery for the Confederacy's 3.5 million blacks effectively ended when Union armies arrived; they were nearly all freed by the Emancipation Proclamation.Slaves in the border states and those located in some former Confederate territory occupied prior to the Emancipation Proclamation were freed by state action or (on December 18,1865) by the Thirteenth Amendment.The full restoration of the Union was the work of a highly contentious postwar era known as Reconstruction.The war produced about 1,030,000 casualties (3% of the population),including about 620,000 soldier deaths—two-thirds by disease.[192] The war accounted for roughly as many American deaths as all American deaths in other U.S.wars combined.[193]
The causes of the war,the reasons for its outcome,and even the name of the war itself are subjects of lingering contention today.Based on 1860 census figures,8% of all white males aged 13 to 43 died in the war,including 6% in the North and 18% in the South.[194][195] About 56,000 soldiers died in prisons during the Civil War.