The period from 1820 to 1860 was marked by a growing sense​

Two Great changes of the Era 1820-1860 which revolted to

1.) Industrial Revolution-(The growth of mechanization of industry)

2.) Market Revolution-(Market Revolution

- The dramatic increase between 1820 and 1850 in the exchange of goods and services in market transactions.

- Resulted from the combined impact of the increased output of farms and factories, the entrepreneurial activities of traders and merchants, and the development of a transportation network of roads, canals, and railroads)

- Not all Americans shared in the new prosperity.

- Created a class divided society (labor class and upper class).

- Challenged the founder's vision of an agriculture republic with few distinctions of wealth (Thomas Jefferson).

the social contract theory

these civilizations were located around fertile rivers, where they could produce an abundance of crops