The best statement that describes the reason is that D The Ku Klux Klan gained power and influence after Southern states lost their statehood under Congressional Reconstruction.
The Ku Klux Klan:
The Ku Klux Klan gained a lot of influence during Congressional Reconstruction as the Southerners felt they had been stripped of their independence and so lashed out at the Blacks whom they didn't consider their equals.
In conclusion, the Ku Klux Klan gained prominence thanks to the frustrations of the South.
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