I don't know in what year Langston Hughes wrote I Dream a World. I know he was born in 1902 in Joplin, Missouri in the US midwest, what some folks call the American heartland. His full name was James Langston Hughes and he attended Lincoln University in Pennsylvania (not Lincoln in Missouri) and lived his life until 1967. Later as a student at Lincoln (in Pa) myself, I first lived in Hughes Hall, named for him. His biographer is Arnold Rampersad, author of The Life of Langston Hughes, 1941-1967: I Dream A World, first published in 1988.
I dream a world where man No other man will scorn, Where love will bless the earth And peace its paths adorn. I dream a world where all Will know sweet freedom's way, Where greed no longer saps the soul Nor avarice blights our day. A world I dream where black or white, Whatever race you be, Will share the bounties of the earth And every man is free, Where wretchedness will hang its head And joy, like a pearl, Attends the needs of all mankind-- Of such I dream, my world! - The Collected Poems of Langston Hughes, edited by Arnold Rampersad (New York: Alfred A. Knopf, 1994), p. 311.