In 1921, Nairobi had 24,000 residents, of which 12,000 were native Africans. The next decade saw growth in native African communities in Nairobi, and they began to constitute a majority for the first time. This growth caused planning issues, described by  Thorntorn White and his planning team as the "Nairobi Problem". In February 1926, colonial officer Eric Dutton passed through Nairobi on his way to Mount Kenya, and said of the city: