How did slavery change over time in colonial America?

However, many consider a significant starting point to slavery in America to be 1619, when the privateer The White Lion brought 20 African slaves ashore in the British colony of Jamestown, Virginia. The crew had seized the Africans from the Portugese slave ship Sao Jao Bautista

Explanation:

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.

they both built pyramids.