Jews have tended to form relatively closely related groups in independent communities, with most in a community sharing significant ancestry in common. For Jewish populations of the diaspora, the genetic composition of Ashkenazi, Sephardi, and Mizrahi Jewish populations show a predominant amount of shared Middle Eastern ancestry. According to Behar, the most parsimonious explanation for this shared Middle Eastern ancestry is that it is "consistent with the historical formulation of the Jewish people as descending from ancient Hebrew and Israelite residents of the Levant" and "the dispersion of the people of ancient Israel throughout the Old World". North African, Italian and
Ethnoreligious group and ancestral ties. The legal assignement what is an ethnoreligious group can differ from the above given definition. Some ethnoreligious groups' identities are reinforced by the experience of living within a larger community as a distinct minority. Ethnoreligious groups can be tied to ethnic nationalism if the ethnoreligious group possesses a historical base in a specific region. In many ethnoreligious groups emphasis is placed upon religious endogamy, and the concurrent discouragement of interfaith marriages or intercourse, as a means of preserving the stability and historical longevity of the community and culture. Prior to the Babylonian exile the Israelites had already