They used to elsewhere, as well. In most European countries chip and pin became ~mandatory around the turn of the century, which made it impossible.
For various reasons the US was very slow to adopt chip-based cards, and even when it did they were usually chip and sig. It was also slow to adopt tap to pay (likely because mobile terminals were less of a thing, because chip and pin was not a thing); it only _really_ took off when Apple and Google kinda forced the issue by putting it in phones.
I think Apple and Google released their implementations when they did exactly because the US credit card companies moved over to EMV (tap and pay) standard.
There was a “liability shift” [1] that happened nearly a decade ago after many high profile card database leakage events (target retail stores being one).
The shift was that instead of credit card companies always accepting the liability for stolen cards, the policies were changed so that retailers that still used magnetic stripes would have to accept liability (because with magnetic stripes, the same card number is used everywhere). Or they could avoid it by moving to chip and wireless readers, since these protocols used a different virtual card number for every transaction.
As card holders, we all started getting our banks sending us new chip and wireless cards before Apple Pay came out.
> exactly because the US credit card companies moved over to EMV (tap and pay) standard.
That's not what EMV is, or, at least, while most tap and pay cards are EMV (besides some 90s oddities in Europe), EMV long predates tap and pay (it's from the 1980s).
Most US cards were EMV (chip and sig, usually, not chip and pin), _long_ before Apple/Google Pay came out, but usually did not support tap to pay, which is a separate standard also falling under EMV (the terminology is kinda unhelpful).
For various reasons the US was very slow to adopt chip-based cards, and even when it did they were usually chip and sig. It was also slow to adopt tap to pay (likely because mobile terminals were less of a thing, because chip and pin was not a thing); it only _really_ took off when Apple and Google kinda forced the issue by putting it in phones.