What do geopolitical border, "border milieu" and metaphoric borderlands mean?

Mac

New member
for one of my essay topics the question is:
Citing examples from readings throughout the course, discuss how the ‘border milieu’
shapes our understanding of the U.S Mexico borderlands. Remember, to include concepts relating to the geopolitical border as well as metaphoric borderlands.

-I do not understand it very well because those terms are somewhat unclear to me. Can anyone help clarify what I am suppossed to discuss for this topic. Thanks!
 
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