Genocide is the deliberate extermination of one group by another. One outcome of contacts between European colonists and several Native American societies on the Atlantic coast of North America. Egalitarian symbiosis refers to peaceful coexistence and a rough economic and political equality between two groups. Occasional examples of this outcome can be found in the history of world migrations, but they are rare, especially in North America. Some authors argue that by the early nineteenth century, Scottish Americans were approaching equality with English Americans in many areas. A more common result of migration and contact is hierarchy, a significant socioeconomic stratification. Stanley Lieberson noted that migrant superordination occurs when
