Twentieth-century American poetry has been one of the glories of modern literature. The most significant names and texts are known worldwide: T.S. Eliot, Robert Frost, William Carlos Williams, Wallace Stevens, Marianne Moore, Hart Crane, Robert Lowell, John Berryman, Elizabeth Bishop (and some would include Ezra Pound). Rita Dove, a recent poet laureate (1993–1995), has decided, in her new anthology of poetry of the past century, to shift the balance, introducing more black poets and giving…