Human migration
Human migration is physical movement by human
Humans are the only living species in the Homo genus...

s from one area to another, sometimes over long distances or in large groups. Historically this movement was nomad
Nomadic people , commonly known as itinerants in modern-day contexts, are communities of people who move from one place to another, rather than settling permanently in one location. There are an estimated 30-40 million nomads in the world. Many cultures have traditionally been nomadic, but...

ic, often causing significant conflict with the indigenous population and their displacement
Forced migration
Forced migration refers to the coerced movement of a person or persons away from their home or home region...

 or cultural assimilation
Cultural assimilation
Cultural assimilation is a socio-political response to demographic multi-ethnicity that supports or promotes the assimilation of ethnic minorities into the dominant culture. The term assimilation is often used with regard to immigrants and various ethnic groups who have settled in a new land. New...

. Only a few nomadic people have retained this form of lifestyle in modern times. Migration has continued under the form of both voluntary migration within one's region, country, or beyond and involuntary migration (which includes the slave trade
History of slavery
The history of slavery covers slave systems in historical perspective in which one human being is legally the property of another, can be bought or sold, is not allowed to escape and must work for the owner without any choice involved...

, trafficking in human beings
Human trafficking
Human trafficking is the illegal trade of human beings for the purposes of reproductive slavery, commercial sexual exploitation, forced labor, or a modern-day form of slavery...

 and ethnic cleansing
Ethnic cleansing
Ethnic cleansing is a purposeful policy designed by one ethnic or religious group to remove by violent and terror-inspiring means the civilian population of another ethnic orreligious group from certain geographic areas....