How did the Maasai move into central Kenya during the 18th century?

During the mid-18th century, the Maasai migrated into what is now central Kenya from an area located north of Lake Turkana.12

This movement was part of a broader expansion of Plains Nilotic peoples across the region during the 18th century. As they spread, the Maasai moved over much of the area centered on the Rift Valley, eventually reaching as far south as Gogo country in central Tanzania. It has been suggested that these migrations were driven by successive pressures from the Oromo people to the north.3

By the time they established themselves in these new territories, the Maasai were already divided into subtribes of pure pastoralists and mixed agriculturists, and they soon became a dominant force in the region, extending their presence toward Mount Kilimanjaro.3