Final answer:
Ralph Waldo Emerson's 'Nature' essay, published in 1836, is considered the first major work of transcendentalism. It explores the idea that spirituality can be found in nature and contains themes that are expanded upon in Emerson's later works.
Step-by-step explanation:
The essay 'Nature,' published by Ralph Waldo Emerson in 1836, is considered the first major publication of transcendentalism, a philosophical and literary movement in 19th century America.
In this essay, Emerson argues that true spirituality can be found in nature, rather than in the busy working world of society. 'Nature' includes ideas that Emerson would expand upon in his later works, and it reflects his background as a minister and lecturer with its intense tone.