The answer is d: Ford's revolution of the assembly line to make cars less expensive.
although they saw he invented the assembly line he did not it was in fact Ransom E. Olds who did. all that Ford did was improve it. he put a person to do one thing and that was what they did nothing else. this made it faster as to this had nobody fighting to do the job with the person they were working with.
The purchase of Alaska added 586,412 square miles to the U.S.
Map projections include latitude and longitude coordinates that specify positions in a spherical grid, known as graticule.
The reason why people in early farming were able to focus on different kinds of work was <span>Improved farming techniques resulted in food surpluses.</span><span />
