Answered

which literary movement at the end of the nineteenth century helped shape American theater



Answer :

The literary movement at the end of the nineteenth century that helped shape American theater is modernism. Modernism is a literary era that started near the end of the 19th century and quickly became quite relevant in the artistic world, and thus influenced many cultures and literary genres. It lasted until 1940s, when it was replaced by an era that is still ongoing today - postmodernism.