In the US it's been the case since the 70s, with the last wild type polio case in 1984 and vaccine derived polio cases up until 1999. [0] [1].
Then in 2000, OPV was banned in the US. [2]
But the statement, while true, is misleading because of its intention to discredit the use of vaccines at all. Just check the graphs linked before the introduction of the vaccine. Night and day, as horrible as the vaccine caused cases are.
And to be clear about it, children are not getting it by getting vaccinated, unvaccinated people can get it from recently vaccinated ones.
[1] https://en.wikipedia.org/wiki/Polio_vaccine#Vaccine-induced_...