Rock and roll (Rock 'n' roll) arose in the United States in the late 1940s after World War II, from a combination of the rhythms of African American blues, country and gospel music. Though elements of rock and roll can be heard in Canadian country records of the 1930s–1940s, and in American blues records from the 1920s, rock and roll did not acquire its name until the 1950s. "Rock"' or its forerunners electric blues (Chicago blues) and rhythm and blues (Jump blues) was first heard in the late 1940s by Canadians who were living close enough to the American border to tune into American radio station broadcasts.