The US carrier force could be blown out of the water by modern electric submarines [1]. The chance of Sweden starting a war against the US is not all that great - this mouse does not roar - but the same or similar technology (Stirling engines, fuel cells, a boatload of 18650 cells running a sub, etc) are available to parties which might stand to gain more from such a conflict. Replacing a carrier takes years, blowing one up takes a few minutes. Were I in command of the US carrier fleet I would be very mindful of this threat and make sure I always have the fleet dispersed with at least one battle group somewhere behind 'safe' lines.

[1] https://nationalinterest.org/blog/the-buzz/swedens-super-ste... (and many other similar articles elsewhere)