What might explain the close connection between calls for religious revival and campaigns for social reform in the 1830s and 1840s

The correct answer to this open question is the following.

The close connection between calls for religious revival and campaigns for social reform in the 1830s and 1840s is the religious movement called the Second Great Awakening that started in the United States in 1790 and ended approximately in 1840.

Basically impulsed by protestant religious members of the Methodist and Baptist congregations, the Second Great Awakening. As these congregations were preaching about the second coming of Jesus, they believe that they had to emulate the life and example of Jesus of Nazareth in order to get salvation. These concepts inspired people who participated in social reforms of the 1830s and 1840s.  

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

mickey : )

explanation:

why not?