Why did many Americans move from rural areas to cities in the mid-1800's?

In the mid-1800s, many Americans moved from rural areas to cities primarily due to industrialization, which created job opportunities in factories and urban industries. The promise of better wages and living standards attracted people seeking economic advancement. Additionally, advancements in transportation, such as railroads, made it easier to travel to cities, while agricultural changes reduced the need for labor on farms. This migration contributed to the rapid growth of urban centers during this period.