I ran into search engine that has wider scope than anything I've seen so
far. Ever got hit dated 1890?
https://unz.org/Pub/Search
For example, "identity politics":
https://unz.org/Pub/Search?ContentType=Article&=1980-1990&XPeriod=1980-1990&=&=&=&=Readable&Options=Readable&=&=&=&Text=%22identity+politics%22&=&=&Action=Search
The first mention of the phrase happens around 1987:
https://unz.org/Pub/MarxismToday-1987apr-00026?View=PDF
in the predictable place.
Or views on cryptography from 1907:
https://unz.org/Pub/Bookman-1907dec-00345?View=PDF&Text=cryptography
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