What democratic feature in the U. S. Senate was introduced during the Progressive Era? How did this expand popular sovereignty in the U. S.?

companies passed on production and transportation costs to consumers

according to my research (britannica and quizlet) the first settlements were along the huang river because it could give the crops more fertile soil that really it out. this was due to the yellow slit caused by floods of the river.

they forced them to b sell their land