Since southern blacks were not allowed to fight in the civil war, how were they able to contribute to the war effort?

Joining the army anyway.

Explanation:

Southern Blacks were not legally allowed to fight in the Civil War. However, many did not respect this rule and joined the fight anyway. African Americans had a particular interest in the Civil War, as the states of the Confederacy were slave states, and the states of the Union were free states. The outcome of the war could determine the status under which the slaves lived. Therefore, many of them contributed to the war effort.

the right choice would be a. culture within the city-state. c. loyalty to the police. d separation by land and sea.