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The majority of US cards are set to Chip+Signature as their default.
There are a few like The Barclays Aviator that is Chip+Pin but they’re rare.
When a Chip+Pin card is inserted into a US Card reader it defaults past Chip+Pin to Chip+Signature.
Similarly, when a US Chip+Signature card is inserted into a Chip+Pin system in the rest of the world it goes to the Chip+Signature default and prints out a slip to be signed.
With the increased use of tap-to-pay tech in card readers and cards themselves this is less and less of an issue these days unless it is a large transaction.
There are a few places where this can still be an issue if there isn’t a tap-to-pay option available and those are parking garages, unmanned train/metro kiosks & the pumps at gas stations but paying inside works.
If you set up a pin for a Chip+Signature card it will not work like a true Chip+Pin card as the system uses the pin for a cash advance function, not purchase.