D)to keep Southerners from taking over the state governments
That's the correct answer.
I believe the answer is: <span>Simon bar Kokhba
</span> <span>Simon bar Kokhba rebelled against the roman in order to form an independent Jewish state that was free from Roman's influence.
</span>He managed to surrounded the roman soldiers on the Briton but fail to get around the Hadrian wall which roman built as defense stronghold.