Why does Du Bois think that Washington's outlook reflects major elements of social thought in the 1890s

1) how did the mexican american war ignite a conflict over slavery between the north and the south? 2) explain how agricultural and textile factories impacted the economic development of south carolina. 3) explain how the results of the 1860 presidential election and the issue of states rights influenced south carolina’s decision to secede from the union. you: )