Final answer:
Free verse replaced the traditional stanza in poetry, with Walt Whitman being credited for introducing it into English-language poetry. Modernists in the twentieth century further popularized and embraced free verse as a way to capture the fragmented and accelerated modern world.
Step-by-step explanation:
Who replaced traditional stanza to free verse? Free verse, which is a form of poetry that does not follow standard or regularized meter or rhyme scheme, replaced the traditional stanza. While there were poets who experimented with free verse before Walt Whitman, he is often credited for introducing it into English-language poetry with his work 'Leaves of Grass.' Later-nineteenth century poets like Matthew Arnold in England and the French symbolists also explored the use of free verse, but it was the modernists in the twentieth century, such as T.S. Eliot, Ezra Pound, and William Carlos Williams, who further popularized and embraced free verse as a way to capture the fragmented and accelerated modern world.