American Fundamentalism???
Oh, you mean Patriotism.
God and Country kind of stuff.
Only 120 years old? What happened in 1887 that brought all that about?
Nope, nothing to do with Nationalism. American as a adjective to identify and differentiate from other varieties of Fundamentalism from other times, other places
Only 120 years old? What happened in 1887
Sheesh, unjustified precision. I said "about" (that's scientific term, meaning ballpark figure)
In this case it was in the late 19th Century when rustic American preachers realized they could become religious authorities by claiming anyone with no education (well not literally anybody, mainly them) could simply read the Bible and understand the context - with no reference to viewpoints of past scholars.
In many ways an anti-conservative and progressive position, coresponding to the contemporary rise of American Populism - no coincidence Wm Jennings Bryan was both Fundamentalist and Populist.