The other areas will be hyper-Republican areas that have been hyper-Republican for decades, typically ranch country in the High Plains and places where Mormons predominate. Those "other areas" are going to go Republican with 70% or higher votes for Republicans for reasons other than race.
Of course the map may understate a reality in which hyper-urban areas can negate the effect of thinly-populated ranch country upon a state margin. Greater Atlanta can make Georgia close in Presidential elections; so can several large cities in Texas (Houston, Austin, San Antonio, El Paso, Dallas, and Fort Worth could make Texas close ten years or so from now.