How were the north and south similar in ways they gathered their armies?
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a. both sides implemented a draft in the first year of the war.
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b. both sides enlisted the of african americans.
c. both sides allowed wealthy men to hire substitutes to serve in their place.
d. both sides experienced riots after they enacted their draft law.

Of the alternatives, the only one correct about North and South is C. Both sides in their drafts created ways for men to don't go to war which involved paying money.

Both Union and the Confederates in the second year of war, 1862, utilized draft in order to get more men after the initial enthusiasm of the war faded.

Only the Union experienced riots after it's draft law, mainly in New York City. Although on the South draft laws weren't popular either and a large number of Southerners deserted.

The Union issued the Emancipation Proclamation in 1863 which brought large numbers of African americans to the war. Confederates did not dare such similar moves for fear of undermining the legitimacy of slavery.

the answer would be:

b. race