This cartoon expresses the opinion that a) laborers should quit their jobs and join the military. b) a war will hurt the u.s. economy by depleting the workforce. c) the government must choose between supporting the workers or supporting the soldiers. d) citizens can support a war effort by joining the military or by giving their labor at home.

The answer is:

D) citizens can support a war effort by joining the military or by giving their labor at home.

Even though some cartoonists were in favor of war and others were against it, this First World War political cartoon suggests that everyone should get involved. Therefore, Uncle Sam is depicted as demanding people to either join the armed forces to fight or work hard to support the American military campaign.

a) through attrition and massive advances on several fronts

Explanation:

American Civil War or simply Civil War in the United States was a war (although Congress never issued a Declaration of War) waged in the United States from 1861 to 1865. As a result, among other things, a historical controversy over slavery and against of the attempts of the American federal executive to take powers that did not correspond to him in a constitutional manner, the war broke out in April 1861, when the forces of the Confederate States of America attacked Fort Sumter in South Carolina, shortly after President Abraham Lincoln assumed his position. The nationalists of the Union proclaimed loyalty to the Constitution of the United States. They clashed with secessionists from the Confederate States, who defended the rights of states to expand slavery.