What part of Congressional Reconstruction dramatically reduced the number of white Southerners (men) who could vote?
a.
the 14th Amendment
b.
an oath stating African Americans should have the right to vote and hold public office
c.
the 13th Amendment
d.
an oath stating that they had not voluntarily fought for or supported the Confederate government

d.  an oath stating that they had not voluntarily fought for or supported the Confederate government

Explanation:

It's the only choice that makes sense.

13th Amendment states that slavery or servitude is not allowed in the US, except it be a punishment enforced onto a convict.

14th Amendment states that anybody who is a citizen is subject to the jurisdiction of the US government, and limits the powers of the US government.

b. is false, as we see that Apartheid and white superiority still exist throughout the years, and the African Americans rarely were given positions of power, and struggled to be able to use their newfound rights in the deep south.

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new evidence is discovered.

oversights and errors are corrected,

new technology is applied to evidence.

letter a is the answer