The tactic that was not used to keep blacks from exercising their civil rights in the post-Civil War South is: C. due process.
In the post-civil War South, the blacks were subjected to intense slavery. They were used to cultivate the ground since the South depended much on its agricultural produce.
Due process entails discharging daily activities in accordance with the constitution.
The South had no laws that protected the blacks. So due process was not a tactic was used to keep blacks from exercising their civil rights in the post-Civil War South.
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