Answer number 4.
New technology in agriculture in the late 1800's created many possibilities for planting seeds and harvesting, but one of the negative consequences was that technology and machines replaced many farmworkers.
Bye the end of that century, Agriculture move from the necessity of having too many farmers to be a mechanized industry for fast selling products.
The beginning of the 1900's saw the coming of modern gas tractors to be used in the farming fields.
