The word commonwealth comes from the Middle Ages term common-weal, or "the common wealth." Wealth in the Middle Ages did not refer to money but to well-being. In what sense is commonwealth concerned with its citizens well being or quality of life?

"A commonwealth is a traditional English term for a political community founded for the common good. Historically, it has sometimes been synonymous with "republic". The noun "commonwealth", meaning "public welfare, general good or advantage", dates from the 15th century."

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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.

the french gave their support to another tribe during he war.