Who had larger population in the civil war

Northern states

Step-by-step explanation:

northern states have the total population of 22 million. The southern states have population of 9 million.

This disparity was reflected in the size of the armies in the field. The Union forces outnumbered the Confederates roughly two to one.

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Nearly 21 million people lived in 23 Northern states. The South claimed just 9 million people - including 3.5 million slaves - in 11 confederate states. Despite the North's greater population, however, the South had an army almost equal in size during the first year of the war.