What type of government has citizens elect officials to make the system efficient?

Between the world wars eisenhower's presidency the 1960s what is the organizing principle of this list?

Which sentence best explains how steam power changed agriculture in england between 1810 and 1850? a. farmers started using steam-powered machines to spray chemical fertilizers and pesticides. b. livestock farmers began using steam-powered machines to milk cattle and shear sheep. c. steam-powered railways transport and sell agricultural produce far from where it was grown. d. steamships to transport large numbers of people from the united states to english farms.

The u.s. constitution outlawed slavery. true false