Let's not pretend that San Antonio and Austin has a large black population tho. Or either Corpus, El Paso, Amarillo, or Lubbock. Both SA and Austin combined have around 300k. Only Dallas-FW and Houston has over a million. So I'll your What if with Savannah and raise a Austin, or a Beaumont, or one of East Texas towns in Tyler, Longview, or Marshall.
If Savannah were poppin' like Atlanta as a destination for Black people from North Florida, Georgia's Black population would be 4 million or 5 million, easily.
Columbus is right on the Alabama border. If it ever gets poppin' as a draw for Black people from Alabama, Georgia's population would be in the 6 million range, breh.
Texas is helped in that DFW, as a major metroplex, draws Black people from Arkansas, Oklahoma and Northern Louisiana. Houston serves to draw Black people from Southern Louisiana. Plus, Katrina helped boost its numbers.
Georgia really only has Atlanta.
Imagine if a hurricane were to devestate Northern Florida somehow. Where do you think those people would go?