Included in the following primary source set are a variety of resources ranging from sheet music to promotional fliers and propaganda materials. Immigrants in the United States during and after the wartime era surrounding WWI were encouraged to offer their support in a variety of contexts. The first worldwide war (called the Great War at the time) roiled emotions for immigrants from countries all over the globe. Loyalty became a priority. At the same time, immigration from most European countries of origin became impossible. Concern for and treatment of refugees arose during the war and continued after.