How Six Flags Killed a Theme Park

YouTube sources as they appear in order:
The Opening of Great America in Gurnee Ill, 1976: https://www.youtube.com/watch?v=KxCElyycAWA
SUPERMAN: Ultimate Flight - Six Flags Great America POV: https://www.youtube.com/watch?v=Ia4FX-6tIHs
Marriott's Great America - Gurnee, IL - 1976: https://www.youtube.com/watch?v=_AL19CcxSEc
Mariotts/Paramount/California's Great America July 1977: https://www.youtube.com/watch?v=7sYb4uEzxcE
Marriott's Great America circa 1978: https://www.youtube.com/watch?v=OFGutYfVydA
Six Flags O G...the 80s: https://www.youtube.com/watch?v=t3Oxc-2viOo
shockwave six flags great america: https://www.youtube.com/watch?v=ncXK1ucJLCM
iron wolf six flags great america: https://www.youtube.com/watch?v=9_h2sOfJMpU
BATMAN The Ride - Six Flags Great America POV: https://www.youtube.com/watch?v=HG17CiybS-8
Memories from Knott's Berry Farm, CA (24 Jun, 1991): https://www.youtube.com/watch?v=0C0mBzjF1AU

Image sources as they appear in order:
Disney's America concept art from Disney
Disney's America Crossroads USA concept art from Disney