Reading Resina's article "Cold War Hispanism"--he says something to the effect that the role of the humanities is to justify themselves: "Could it be that the perennial crisis of the humanities is a trope for the inherent insecurity of this bundle of disciplines that exist, precisely, in and through the never-ending effort to legitimate themselves?" (emphasis added). This makes sense. Just as the "canon" only comes into view when it is a problem, the humanities only thrive in crisis mode, because they are the disciplines whose primary function is to confer value on their own subject matter, to certify and credentialize forms of cultural capital. "Prove that what you are studying is worth while." "Justify your own existence." No wonder we are so defensive! Now I am understanding why nationalism is so strong in the humanities. That is a default justification.
This also explains why the default mode of the humanities is the weak leftism of cultural exceptionalism. That requires a whole 'nother post to explain. Briefly, we are the dominated part of the dominating class, as Bourdieu points out.
I can argue for Lorca's relevance through Spicer or O'Hara, Ginsberg or Duncan, or even Billy Strayhorn. But of course that is already assuming the value of these American figures.