ISS stems from Space Station Freedom[1], which itself has its roots in the the Space Transportation System's space station component[2]. The Space Shuttle was a

ISS stems from Space Station Freedom[1], which itself has its roots in the the Space Transportation System's space station component[2]. The Space Shuttle was a part of the Space Transportation System and the only part to receive funding and see development. [1]: https://en.wikipedia.org/wiki/Space_Station_Freedom https://en.wikipedia.org/wiki/Space_Station_Freedom [2]: https://en.wikipedia.org/wiki/Space_Transportation_System https://en.wikipedia.org/wiki/Space_Transportation_System