It seems you have excellent credentials. I would say definitely give it a shot. Columbia is extremely competitive, it was my dream school, and I got rejected after being shortlisted for admission and interviewing there. It is difficult to get in to any of the top tier programs without a masters as well, keep that in mind. My program has accepted a total of 3-4 students out of 30+ with just a bachelors over the last six years.
Aside from Columbia, I would consider UCLA, Emory, maybe Duke, Vanderbilt. My department, CUNY Graduate Center, is very diverse in terms of specialties and very competitive, but we have at least 7 professors who have similar interests to yours, and we've just hired a full-time Cameroonian professor who specifically writes about diaspora and migritude.