The Second Great Awakening was a religious movement in the 19th century, it focused on more individual responsibilities. To do so, they gathered people to reawaken their faith, they did intense religious practices with thousands of people called revivals.
Transcendentalism was a philosophical and literary movement in the 1800s, it emphasized the simple life and celebrated the truth found in nature, personal emotion and imagination.
Both Second Great Awakening and Transcendentalism emphasize the power of the individual over the majority. The evangelists of the Second Great Awakening preached that people had power on their personal spirituality and the transcendentalists were concerned with the individual soul.