Back when Marriott built the Great America theme parks in Chicago and San Francisco, there were plans to build a third one in Howard County, Maryland. When that failed, they turned to Prince William County, and got the zoning change approved, but environmentalists challenged it and won. Because of this, only two Great Americas were built that eventually ended up in separate hands in 1984-5. What if they were able to build a third Marriott's Great America? What would its fate be compared to the other two. Would it have kept Marriott in the theme park business, or would they have left, maybe even sooner?