OpenStax
Open Stax: An Awakening of Religion and Individualism
This section of a chapter on "Antebellum Idealism and Reform Impulses" explains the connection between Evangelical Protestantism and the Second Great Awakening and describes the message of the transcendentalists.
Khan Academy
Khan Academy: Us History: 1800 1848: Quiz 3
A quick comprehension check over reform movements in the US during the mid 1800s.