Hi There! :)
How did journalism affect modernist style?
It was felt to be so shocking and inhumane, so contrary to human life that the old forms of writing would not suffice. Poems with a connected set of images or thoughts, narratives with the usual kind of resolutions, plays that focused on a single, defined plot were outmoded. They could not express the horrific consequences of being killed by a bomb from above, or murdered indifferently in a combat in which neither of the participants had any vested interest.
Thus you get books like Joyce's _Ulysses,_ in which the action consists of everyday doings and the thoughts of people given the reader without, seemingly, any interference on the part of the author, or poems like _The Waste Land,_ where Eliot offers a few "fragments" "to shore against...ruins."