What are sum imoprtant spaceships' names in ameican history?

It's hard to answer this question since there are many "names" for a certain spaceship (callsigns, mission names...) . But basically you have Mercury, Gemini and Apollo. Then you could consider SkyLab and the International Space Station as "spaceships" even though they are stations more than ships. Then of course you have the Space Shuttle and the new spacecraft, Orion.