Why were the 'roaring '20s' a prosperous period?

Because they had tons of people

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.

hi friend   look late me tall   you with my experience first politic because this subject   it is more politic than be religious   and also give you my experience in islam

first   the islam it is not religion order to kill for we be clear .

so bin laden he not was man of religion   for he use they taught sound islamic theology.

osama bin laden he was influenced by mullah mohammad omar, a very radical manosama bin laden's little understanding of religion has made osama bin laden's speech radical and deviated from the teachings of islam

so the answer > they used radical persuasive rhetoric