The answer to this question is 4. Industrialization caused urbanization and a population boom.
Answer:
advances in tool making technology led to advance in agriculture and farming revolutionized the world and set prehistoric humans on a course toward modernity inventions such as the plow helped in planting of seeds. no longer did human have to depend on the luck of the hunt.
The way we live now is the cause of why some stupid people want to run for president the world will end soon and I am going to heaven hopefully and all you bad people that don't believe in god are going to die in hell burn
Population grew significantly mostly due to reproduction, but there was a significant number of immigrants, Scots-Irish and Germans, coast was more wealthy than west.