Question: Wendell Phillips Before the Concord Lyceum, is an essay style letter-to-the-editor written by Henry David Thoreau, an essayist, poet, philosopher, abolitionist, naturalist, tax resister, development critic, surveyor, and historian, of which nationality? 
Sentence (from "Henry David Thoreau"): Henry David Thoreau (see name pronunciation; July 12, 1817 – May 6, 1862) was an American essayist, poet, philosopher, abolitionist, naturalist, tax resister, development critic, surveyor, and historian.
Relevant evidence: Yes