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NASA mostly runs on SpaceX, so it depends if you consider ISS to be critical. But I wouldn't say it would be mind boggling.

Cool, nationalise SpaceX, reintegrate its costs into NASA, done.

The US would never let its access to space be cut off.

Watch lmao.

The US actually did just that when it retired the shuttle program. We had to rely on Russia to get to the space station.