The Oromo migration results, in a more immediate sense, in a weakening of both Christian and Muslim power and drives a wedge between the two faiths along the eastern edge of the highlands.

In the Christian kingdom, Oromo groups infiltrate large areas in the east and south, with large numbers settling in Shewa and adjacent parts of the central highlands.

Others penetrate as far north as eastern Tigray.

The effect of the Oromo migrations is to leave the Ethiopian state fragmented and much reduced in size, with an alien population in its midst.

Hereafter, the Oromo play a major role in the internal dynamics of Ethiopia, both assimilating and being assimilated as they are slowly incorporated into the Christian kingdom.

In the south, the Sidama fiercely resist the Oromo, but, as in the central and northern highlands, they are compelled to yield at least some territory.

In the east, the Oromo sweep up to and even beyond Harar, dealing a devastating blow to what remains of Adal and contributing in a major way to its decline.