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Initially, in '89, the standardization of C++ was handled by ANSI X3J16. Starting in '91 ISO WG21 joined in. You may want to read BS's A History of C++:1979-1991. IMO, "ANSI C++" is just a leftover name; the language is "ISO C++" even though ANSI is indirectly involved in the standardization.
https://stackoverflow.com/questions/5863051/what-is-ansi-c