Relationship between industrial and urbanization in the early 1800s,
Workers were drawn to industrial areas in the cities, multiply both urbanization and industrialization at the same time. Industrialization commanding to urbanization by creating economic growth and job opportunities that draw people to the cities.
One of the key ideas of laissez-fair policies was that the government--both state and federal--would play an absolutely minimal role in the economic affairs of the public, since these people believed that government intervention hurt productivity.
They were an investment and used as goods for sale. This practice was used up to the 1850's when the US banned it. But other slaves came from this which included Chinese, Italian Irish etc.
The answer is water because today not everybody has gold or land or silver and everybody has water and til this day still uses it.