What was a major argument used by the Antifederalists to oppose ratifying the Constitution?
(1) Congress was given the power to tax goods.
(2) The executive branch lacked the power to maintain order.
(3) The proposed Constitution contained no bill of rights.
(4) Only the national government could coin money.

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.

c) troops march forward in close formation against newer, more accurate weapons

a drastic rise in oil prices ended decades of postwar.