Today, job access in metropolitan areas is far easier – shorter commute distance, for instance – in the suburbs by car rather than by transit in cities. Therefore, any population group which is improving its penetration into the job market is moving to the suburbs. Moving to the suburbs improves access to jobs.
In 2000, the suburban and ex-urban population was relatively more white (79%) than the urban population (59%). Thus, it is reasonable to expect that additions to the suburban population since 2000 is mainly non-white. As it turned out, virtually all suburban and exurban growth since 2000 was non white.
Between 2000 and 2019, Hispanics made up a majority of the suburban and exurban population growth (50.9%), adding 14.1 million. Asians accounted for 19.6% of suburban and exurban growth, an increase of 5.4 million. African-Americans made up 19.6% of suburban and exurban growth, an increase of 5.4 million. All other groupings (other races and multiple races) were 5.9% of suburban and exurban growth, an increase of 1.6 million. The balance of the growth, 4.0% was White-Non-Hispanics, with the smallest increase, at 1.1 million. (from here and here.)