Although not exactly on the student's main focus, there may be something of
interest in the following texts:
KENWORTHY, Eldon (1995). America/Americas: myth in the making of U.S. policy
toward Latin America. University Park: The Pennsylvania State University
Press.
RICENTO, Thomas (2003). "The discursive construction of Americanism."
Discourse & Society, vol. 14 (5).
I hope these will help.
Huascar Pessali