The presidential election of 1860 revealed that:
a. if united the north could defeat the south in national elections
b. the split of the democratic party, north and south, was the formula needed for the
republican party to win a national election
c. slavery was not as popular as it had been in the past as most people voted for the anti-slavery party of lincoln
d. the democratic party needed to alter its platform to fit the need of southerners in
regards to slavery

A

Explanation: Because Lincoln was a Democrat, and it shows that when the North was united they beat the South in the Election.

i believe the answer is:

-   william jennings bryan is a democrat while mckinley was a republican

at that time, the segment of population that choose for democratic party were the voters with low economic background and vice versa

- william jennings has support of populists and wants to have inflation to farmers while mckinley has support of bankers and businessmen , doesn't want inflation

the fixed value of gold make the large business able to stack up their gold without   being worried that it would devaluated.

- william jennings supported the silver standard while mckinley supported the gold standard

according to jenning, using other metal beside gold could the poor people to have more purchasing power and them advance in the society.