Internal migration tends to be travel for education and for economic improvement or because of a natural disaster or civil disturbance,[1] though a study based on the full formal economy of the United States found that the median post-move rise in income was only 1%.
A general trend of movement from rural to urban areas, in a process described as urbanisation, has also produced a form of internal migration.
In the United States, the Office of Refugee Resettlement, a program of the U.S. Department of Health and Human Services's Administration for Children and Families, is tasked with managing the secondary migration of resettled refugees.
[7] Secondary migration has been hypothesised as one of the driving forces behind the distribution of resettled refugees in the United States.
Goldade et al.[11] employed geographical bounds and political afliation of communities, in addition to utilizing network structures.