
⚘The Roman Republic (Latin: Rēs pūblica Rōmāna [ˈreːs ˈpuːblɪka roːˈmaːna]) was the era of classical Roman civilization, led by the Roman people, beginning with the overthrow of the Roman Kingdom, traditionally dated to 509 BC, and ending in 27 BC with the establishment of the Roman Empire. During this period, Rome's control expanded from the city's immediate surroundings to hegemony over the entire Mediterranean world

Since Southern blacks were not allowed to fight in the Civil War, they were able to contribute to the war effort by joining the army despite the rules against it. Thank you for posting your question. I hope this answer helped you. Let me know if you need more help.