<span>the emergence of the middle class</span>
I believe it is the second one.
It provided a source of power for many kinds of machines.
Answer: the maps were changed due to the scramble for Africa and how Europe divided up the land
Explanation:
They either worked in factories or worked on farms
Henry Ford improved B. assembly-line principles. Ford improved the assembly-line under the idea that it is more efficient for one person to do a single task over and over than it is for one person to put together an entire car. For instance, on the assembly line, a car would come by and Worker A would installs windshields. The car would then pass to Worker B who installs headlights and then to Worker C who adds the tires. This process is more efficient than Worker A, B, and C each putting together an entire car.
