Answer:
1 the assembly Line
The reason the Ford Model T was the first affordable and mass produced automobile was because it was produced in an assembly line, making it much faster and cheaper, and thus making the sale price a lot lower.
2. Steam
The early industrial age was marked by the use of steam powder to make manufacturing a lot more effective, faster and cheaper. This happened first in Great Britain during the late 18th century.
3. It significantly reduced the cost of producing steel, making the material more available for building machinery, railroads, and skyscrapers.
Steel was a necessary material for building most structures in cities and roads. Steel is produced by removing impurities from iron, and the Bessemer process was the first inexpensive way of doing it.
4. Homestead Act
Signed by president Abraham Lincoln in 1862 the Homestead Act's purpose was to expand civilization of the United States towards the West. By giving cheap land to citizens, the government also allowed for most men and women to get a "fair" chance.