https://en.wikipedia.org/wiki/Project_Mars:_A_Technical_Tale

"...Project Mars: A Technical Tale takes place in 1980, thirty years in the future. The world is governed by the United States of Earth, established after a devastating war in the 1970s between the Western Powers and the Eastern Bloc. The West won the conflict with the aid of Lunetta, an orbiting space station that dropped nuclear missiles on the Soviet Union.^[a] Soon after peace is achieved, a reflecting telescope on Lunetta confirms the existence of canals on Mars, vindicating Percival Lowell's assertion that intelligent life exists on the planet. The President orders a mission to Mars to establish just how intelligent the Martians are and whether they pose a threat to Earth...."

 I just downloaded(&uploaded below) it and haven't read it yet