Question: The Mars Society is an American worldwide volunteer-driven space-advocacy non-profit organization, inspired by "The Case for Mars" conferences which were hosted by The Mars Underground at the University of Colorado Boulder, a public research university located in Boulder, Colorado, in which country?
Sentence (from "University of Colorado Boulder"): It is the flagship university of the University of Colorado system and was founded five months before Colorado was admitted to the Union in 1876.
Relevant evidence: No