During World War II, the United States officially had no propaganda, but the Roosevelt government used means to circumvent this official line. One such propaganda tool was the publicly owned but government-funded Writers' War Board (WWB). The activities of the WWB were so extensive that it has been called the "greatest propaganda machine in history". "Why We Fight" is a famous series of US government propaganda films made to justify US involvement in World War II. Response to the use of propaganda in the United States was mixed, as attempts by the government to release propaganda during World War I was perceived negatively by the American public. The government did not initially use propaganda but was ultimately persuaded by businesses and media, which saw its use as informational. Cultural and racial stereotypes were used in World War II propaganda to encourage the perception of the Japanese people and government as a "ruthless and animalistic enemy that needed to be defeated", leading to many Americans seeing all Japanese people in a negative light. Many people of Japanese ancestry, most of whom were American citizens, were forcibly rounded up and placed in internment camps in the early 1940s.