What is Modernism ? It is a philosophical movement that, along with cultural trends and changes, arose from wide-scale and far-reaching transformations in Western society. This became a huge part of the United States during the 1920s. Prior to the era of of Modernism, Propaganda was the main use throughout the United States. Before the US entered the war, they promoted neutralization. However, when they entered the war, the US used propaganda to promote patriarchalism. The era of Modernism helped the United States by the new introduction of cars, films, and the Red Scare. The new introduction of cars became a huge success for the United States. Prior to automobiles first making their debut, horses and carriages were the main source of transportation.