World War I was so massive, people referred to it simply as the Great War. It began in 1914 as a fight for domination between two groups of European nations: the Allied Powers—led by Russia, France, and the U.K.—and the Central Powers, headed by Germany, Austria-Hungary, and the Ottoman Empire, centered in what is now Turkey (see timeline slideshow, below). By the time the last shots echoed four years later, about 20 million people—both soldiers and civilians—had been killed, making it the deadliest war up to that point in history.
When the war erupted, America was undergoing its own massive change. Between 1880 and 1910, 17 million immigrants had arrived in the U.S. While earlier newcomers had largely come from Britain, Ireland, and Germany, most of the immigrants at that time were from Eastern, Central, and Southern Europe. They transformed cities across the nation, bringing new languages, cultures, and traditions. But they also faced discrimination and xenophobia.
Anti-immigrant attitudes grew more intense as World War I raged overseas. Many native-born Americans questioned the loyalty of people who had only recently arrived, especially those from the European countries now fighting America’s allies.
“There are citizens of the United States, I blush to admit, born under other flags … who have poured the poison of disloyalty into the very arteries of our national life,” President Woodrow Wilson declared in a speech in 1916, adding that “such creatures … must be crushed out.”
But immigrants would prove critical to America’s success in the war. Though Wilson had pledged the U.S. to neutrality, the nation entered the fight in 1917. The U.S. military was tiny at that time compared with those of the European superpowers. The U.S. armed forces consisted of only about 200,000 men, while some European armies numbered in the millions. So in June of that year, Congress authorized a draft. Immigrants made up about 14 percent of the U.S. population. But many native-born Americans wondered whether those newcomers would fight for the U.S.—and whether they could even be trained for combat. About half a million foreign-born soldiers would end up proving those doubters wrong.