The story
In the 1980s, ESA devised plans for its own space station called Columbus Man-Tended Free Flyer which could be attached to NASA's Space Station Freedom. America objected to ESA's using Columbus as a building block of a future European space station, and were concerned that they would facilitate the creation of a potential competitor if the crewed space outpost fulfilled its promise as supplier of commercially viable products, such as new materials and pharmaceuticals. Plans were scaled down as a result, and by 1988, Europe proposed to participate with three elements: Attached Pressurized Module, Man Tended Free-Flying platform, plus an uncrewed polar remote sensing platform. This would be supported by the Ariane 5 rocket and the Hermes spacecraft. However, after German reunification, ESA's budget reductions meant something had to be cancelled.
The collapse of the Soviet Union and the Space Shuttle Challenger disaster meant a radical change in plans for a space station. The US and Russia decided to cooperate on an International Space Station. ESA cancelled much of its space station programme to focus on the Columbus module, reconfigured for the ISS. The module was approved in 1995 but delays in station construction meant Columbus would not fly until 2008.
From Wikipedia’s article on European contribution to the International Space Station, shared under CC BY-SA 4.0.3
