Geographical factors such as rivers, mountains, lakes and islands affected migration routes and settlement locations, as well as the relative isolation of the settlements.
Language contact with other language groups, such as Native Americans, French, Spanish, Germans, and African-Americans, along paths of migration and settlement resulted in mutual borrowing of vocabulary, pronunciation, and some syntax.
Language contact is an interactions with other language groups, such as Native Americans, French, Spanish, Germans, and African-Americans, along paths of migration and settlement resulted in mutual borrowing of vocabulary, pronunciation, and some syntax.
Region and occupation is where rural farming people may continue to use archaic expressions compared with urban people, who have much more contact with contemporary life styles and diverse speech communities.
Group reference are categories of group identity, including ethnicity, national origin of ancestors, age, and gender can be symbolized by the way they speak, indicating in-group versus out-group identity.
Linguistic processes are new development that promote the simplification of pronunciation or syntactic changes to clarify meaning can also contribute to language change.