Far be it from me to argue with China and Jim ...

...but the CdV format was still around until 1900 at least - the cabinet card was introduced in the 1870s but did not supplant the CdV by any means. I have hundreds of CdVs that show otherwise

I even have some continental (mainly French and Dutch) CdVs from the 1910s.
I have to say that I have never seen any as late as WW1/1920s but that's not to say it's impossible, however the postcard and other formats had definitely all but taken over by that time.
Cheers
Prue