1)A Modernist poetry is refers to poetry written, mainly in Europe and North America, between 1890 and 1950 in the tradition of modernist literature, but the dates of the term depend upon a number of factors, including the nation of origin, the particular school in question, and the biases of the critic setting the dates.
( 2 Why it’s considered) in poetry, we can discuss the modernist elements in terms of four major subheadings: modern or new experiments in form and style, new themes and word-games, new modes of expression, and complex and open-ended nature of their themes and meaning.