The greatest problem facing the united states during the period of "manifest destiny" was question 12 options: whether indians would be moved to north carolina whether states would let women vote whether slavery would expand across the united states (into newly acquired territory) whether labor unions would be allowed to form

One of the biggest debates during the westward expansion was whether or not the states would be slave states or free states. Side note; this debate would become pointless eventually, as Dredd v Scott ruled that it is unconstitutional to establish slave/slave free regions.

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.