"American protestant fundamentalism is rooted in the Second Great Awakening, back in a previous century"

Okay; that's the root from which the system of beliefs bacame prevalent in America to the degree that it is; the publications from Los Angeles included a wide group of authors from all over the country; it wasn't a matter of a belief system "based in Los Angeles". That was just the point from which strict Biblical believers started labeling themselves as "fundamentalists". No doubt but what many believers have, defacto, believed in the inerrancy of Scripture from the time the writtings of the Bible were collected. But as "modernist" theolgy appeared, conservatives felt more need to formulate explicit defense of Biblical inerrancy.