The thing about Anzaldúa’s book is that it is not just about any borderlands, it is about a specific region. Yes, I know she extrapolates a great deal from there, but it is STILL into largely US based theory (gone global). But it is from a region and the writing voice does have an identity, even if not a flat one.
Axé.
coldhearted scientist وداد 
Ma. Socorro Tabuenca, Debra Castillo, there https://muse.jhu.edu/article/172375” and in the 2006 PMLA. And of course Robert Irwin. And I think there is more.