I believe the answer is smallpox, but I could be mistaken. There were lots of viruses threatening the population at the time but from what I know, smallpox was the largest threat.
Answer:
Joe Biden
<em>hope</em><em> </em><em>it's</em><em> helps</em><em> </em><em>u</em>
He opposed it because he felt that it made the rich get richer and since he favored the common people and felt that it wasn't fair toward the common people .
They did not want slavery to spread.
The reason why the presidential election of 1876 angered Democrats is because "Democrats thought the voting system was <span>unfair" since Tilden actually won the majority of the popular vote. </span>