Edward Robb Ellis, Life in the United States 1914-1918. New York: Coward, McCann and Geoghegan, 1975, p. 428, describing the actions and attitudes of Americans during World War I, after the US declared war against Germany—
Anything mindful of German culture became suspect. Vigilantes inspected public libraries and invaded private homes and burned books by Goethe and Heine and Kant, broke Victrola records that preserved the music of Beethoven and Bach and Wagner. School after school forbade the teaching of the German language, while in clubs and churches and halls there was a ban against speaking German. [In the Iowa home of my father's parents, whose parents had immigrated from Germany in the 1850s, German was guardedly only spoken at home.]
With trembling fingers people plucked their gardens free of bachelor buttons, which was Germany’s national flower. Sauerkraut was renamed Liberty cabbage, hamburger became Salisbury steak. German measles were called Liberty measles, German dishes disappeared from restaurants, seed catalogs referred to German clover as Liberty clover, and bartenders removed pretzels from their free lunch counters.