Six Flags Great America is an amusement park located in Gurnee, Illinois. Part of the Six Flags chain, Great America was first opened in 1976 by the Marriott Corporation as Marriott's Great America. Six Flags has owned and operated the park since 1984, making it the seventh park in the chain. The park offers ten themed areas, as well as Hurricane Harbor, a 20-acre (81,000 m) water park, and three specially themed children's areas.

Is it true that is six flags and great america the same thing?
yes