Human migration is physical movement by humans Humans, known taxonomically as Homo sapiens , are the only living species in the Homo genus of bipedal primates in Hominidae, the great ape family. However, in some cases "human" is used to refer to any member of the genus Homo from one area to another, sometimes over long distances or in large groups. The movement of populations in modern times has continued under the form of both voluntary migration within one's region, country, or beyond, and involuntary migration Forced migration refers to the coerced movement of a person or persons away from their home or home region. It often connotes violent coercion, and is used interchangeably with the terms "displacement" or forced displacement. A specific form of forced migration is population transfer, which is a coherent policy to move unwanted persons, (which includes the slave trade The history of slavery covers systems throughout human history 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. A critical element is that children of a slave mother automatically become slaves. It does not include forced labor by, trafficking in human beings Human trafficking is the illegal trade in human beings for the purposes of commercial sexual exploitation or forced labor: a modern-day form of slavery. It is the fastest growing criminal industry in the world, tied with the illegal arms industry as the second largest, after the drug-trade and ethnic cleansing Crime of apartheid · CERD · CEDAW · CDE · ILO C111 · ILO C100 · ILO C169 · Protocol No. 12 ECHR). People who migrate are called migrants Immigration is the introduction of new people into a habitat or population. It is a biological concept and is important in population ecology, differentiated from emigration and migration or more specifically, emigrants Emigration is the act of leaving one's native country or region to settle in another. It is the same as immigration but from the perspective of the country of origin. Human movement before the establishment of political boundaries or within one state, is termed migration. There are many reasons why people might choose to emigrate. Some are for, immigrants Immigration is the introduction of new people into a habitat or population. It is a biological concept and is important in population ecology, differentiated from emigration and migration, or settlers A settler is a person who has migrated to an area and established permanent residence there, often to colonize the area. Settlers are generally people who take up residence on land and cultivate it, as opposed to nomads. Settlers are sometimes termed "colonists" or "colonials" and—in the United States -- "pioneers", depending on historical setting, circumstances and perspective.

The pressures of human migrations, whether as outright conquest or by slow cultural infiltration and resettlement, have affected the grand epochs in history and in land (for example, the Decline of the Roman Empire The decline of the Roman Empire refers to both the gradual disintegration of the economy of Rome and the barbarian invasions that were its final doom. The English historian Edward Gibbon, author of The Decline and Fall of the Roman Empire made this concept part of the framework of the English language, but he was not the first to speculate on why); under the form of colonization Colonization, , occurs whenever any one or more species populate an area. The term, which is derived from the Latin colere, "to inhabit, cultivate, frequent, practice, tend, guard, respect," originally related to humans. However, 19th century biogeographers dominated the term to describe the activities of birds, bacteria, or plant, migration has transformed the world (such as the prehistoric and historic settlements of Australia and the Americas). Population genetics Population genetics is the study of allele frequency distribution and change under the influence of the four main evolutionary processes: natural selection, genetic drift, mutation and gene flow. It also takes into account the factors of population subdivision and population structure. It attempts to explain such phenomena as adaptation and studied in traditionally settled modern populations have opened a window into the historical patterns of migrations, a technique pioneered by Luigi Luca Cavalli-Sforza Luigi Luca Cavalli-Sforza is an Italian population geneticist born in Genoa, who has been a professor at Stanford University since 1970 (now emeritus).

Forced migration Population transfer is the movement of a large group of people from one region to another by state policy or international authority, most frequently on the basis of ethnicity or religion. Banishment or exile is a similar process, but is forcibly applied to individuals and groups has been a means of social control under authoritarian regimes yet free initiative migration is a powerful factor in social adjustment and the growth of urban populations.

In December 2003, The Global Commission on International Migration (GCIM) was launched with the support of Secretary-General of the United Nations The Secretary-General of the United Nations is the head of the Secretariat, one of the principal organs of the United Nations. The Secretary-General also acts as the de facto spokesperson and leader of the United Nations Kofi Annan Kofi Atta Annan is a Ghanaian diplomat who served as the seventh Secretary-General of the United Nations from 1 January 1997 to 31 December 2006. Annan and the United Nations were the co-recipients of the 2001 Nobel Peace Prize and several countries, with an independent 19-member Commission, a threefold mandate and a finite life-span ending December 2005. Its report, based on regional consultation meetings with stakeholders and scientific reports from leading international migration experts, was published and presented to Kofi Annan on 5 October 2005.^[1]

Different types of migration include:

• Seasonal human migration Seasonal human migration is very common in agricultural cycles. It includes migrations such as moving sheep or cattle to higher elevations during summer to escape heat and find more forage. Human labor often moves with fruit harvest, or to other crops that require manual picking mainly related to agriculture.
• Rural to Urban, more common in developing countries as industrialization takes effect (urbanization Urbanization or Urbanisation is the physical growth of urban areas as a result of global change. Urbanization is also defined by the United Nations as movement of people from rural to urban areas with population growth equating to urban migration. The United Nations projected that half of the world's population would live in urban areas at the end)
• Urban to Rural, more common in developed countries due to a higher cost of urban living (suburbanization Suburbanization is a term used to describe the growth of areas on the fringes of major cities. It is one of the many causes of the increase in urban sprawl. Many residents of metropolitan areas no longer live and work within the central urban area, choosing instead to live in satellite communities called suburbs and commute to work via automobile)
• International migration International migration occurs when peoples cross state boundaries and stay in the host state for some minimum length of time. Migration occurs for many reasons. Many people leave their home countries in order to look for economic opportunities in another country. Others migrate to be with family members who have migrated or because of political

Pre-modern migrations

Historical migration of human populations begins with the movement of Homo erectus Homo erectus is an extinct species of hominid that originated in Africa—and spread as far as China and Java—from the end of the Pliocene epoch to the later Pleistocene, about 1.8 to 1.3 million years ago. There is still disagreement on the subject of the classification, ancestry, and progeny of H. erectus, with two major alternative hypotheses: out of Africa across Eurasia Eurasia is a large landmass covering about 52,990,000 km2 or about 10.6% of the Earth's surface (36.2% of the land area) located primarily in the eastern and northern hemispheres. Sometimes considered a single continent, Eurasia comprises the traditional continents of Europe and Asia (with Eurasia being a portmanteau of the two), concepts which about a million years ago. Homo sapiens Humans, known taxonomically as Homo sapiens , are the only living species in the Homo genus of bipedal primates in Hominidae, the great ape family. However, in some cases "human" is used to refer to any member of the genus Homo appear to have occupied all of Africa about 150,000 years ago, moved out of Africa 70,000 years ago, and had spread across Australia The prehistory of Australia is the period between the first human habitation of the Australian continent and the first definitive sighting of Australia by Europeans in 1606, which may be taken as the beginning of the recent history of Australia. This period is estimated to have lasted between 40,000 and 70,000 years, Asia The history of Asia can be seen as the collective history of several distinct peripheral coastal regions such as, East Asia, South Asia, and the Middle East linked by the interior mass of the Eurasian steppe and Europe Homo ergaster and Homo heidelbergensis evolved in Paleolithic Europe long before the emergence of modern humans traits . The bones of the earliest Europeans are found in Dmanisi, Georgia, dated at 1.8 million years before the present. West Europe was populated since c. 1.2 million ago .. The earliest appearance of European early modern humans has by 40,000 years BCE. Migration to the Americas There have been several models of migration to the New World proposed by various academic communities. The question of how, when and why humans (Paleo-Indians) first entered the Americas is of intense interest to archaeologists and anthropologists, and has been a subject of heated debate for centuries. Current understanding of human migration into took place 20,000 to 15,000 years ago, and by 2,000 years ago, most of the Pacific Islands The Pacific Islands comprise 20,000 to 30,000 islands in the Pacific Ocean. Those islands lying south of the tropic of Cancer are traditionally grouped into three divisions: Melanesia, Micronesia and Polynesia were colonized. Later population movements notably include the Neolithic Revolution The Neolithic Revolution was the first agricultural revolution—the transition from hunting and gathering communities and bands, to agriculture and settlement. Archaeological data indicate that various forms of domestication of plants and animals arose independently in at least seven or eight separate locales worldwide, with the earliest known, Indo-European expansion The Proto-Indo-Europeans were the speakers of the Proto-Indo-European language , an unattested but now reconstructed prehistoric language, and the Early Medieval Great Migrations The Migration period, also called the Barbarian Invasions or German: Völkerwanderung , was a period of human migration that occurred roughly between the years 300 to 700 CE in Europe, marking the transition from Late Antiquity to the Early Middle Ages. These movements were catalyzed by profound changes within both the Roman Empire and the so- including Turkic expansion The Turkic migration as defined in this article was the expansion of the Turkic peoples across most of Central Asia into Europe and the Middle East between the 6th and 11th centuries AD . Tribes less certainly identified as Turkic began their expansion centuries earlier as the predominant element of the Huns. Their prehistoric point of origin was.

Early humans migrated due to many factors such as changing climate and landscape and inadequate food supply. The evidence indicates that the ancestors of the Austronesian peoples Islam, Christianity, Animism, and Hinduism spread from the South Chinese mainland to Taiwan at some time around 8,000 years ago. Evidence from historical linguistics Modern historical linguistics dates from the late 18th century. It grew out of the earlier discipline of philology, the study of ancient texts and documents dating back to antiquity suggests that it is from this island that seafaring peoples migrated, perhaps in distinct waves separated by millennia, to the entire region encompassed by the Austronesian languages The branches of the Oceanic languages: Admiralties and Yapese St Matthias Western Oceanic & Meso-Melanesian Temotu Southeast Solomons Southern Oceanic Micronesian Fijian-Polynesian The black ovals at the northwestern limit of Micronesian are the Sunda-Sulawesi languages Palauan and Chamorro. The black circles in with the green are offshore. It is believed that this migration began around 6,000 years ago.^[2] Indo-Aryan migration Models of the Indo-Aryan migration discuss scenarios of prehistoric migrations of the early Indo-Aryans to their historically attested areas of settlement in the northwest of the Indian subcontinent and from there further across all of North India. Claims of Indo-Aryan migration are primarily drawn from linguistic evidence but also from a to and within Northern India is presumed to have taken place in the Middle to Late Bronze Age, contemporary to the Late Harappan The Cemetery H culture developed out of the northern part of the Indus Valley Civilization around 1900 BCE, in and around western Punjab region located in present-day Pakistan. It was named after a cemetery found in "area H" at Harappa phase in India (ca. 1700 to 1300 BC). From 180 BC, a series of invasions from Central Asia Central Asia is a region of Asia from the Caspian Sea in the west, China in the east, Afghanistan in the south, and Russia in the north. It is also sometimes known as Middle Asia or Inner Asia, and is within the scope of the wider Eurasian continent followed, including those led by the Indo-Greeks The Indo-Greek Kingdom covered various parts of the northwest and northern Indian subcontinent during the last two centuries BC, and was ruled by more than 30 Hellenistic kings, often in conflict with each other. The kingdom was founded when the Greco-Bactrian king Demetrius invaded India early in the second century BC; in this context the, Indo-Scythians The Indo-Scythians are a branch of Sakas , who migrated from southern Siberia into Bactria, Sogdiana, Arachosia, Gandhara, Kashmir, Punjab, Gujarat, Maharashtra and Rajasthan, from the middle of the 2nd century BCE to the 4th century CE. The first Saka king in Pakistan and India was Maues or Moga who established Saka power in Gandhara (Pakistan), Indo-Parthians The Indo-Parthian Kingdom was established during the 1st century by Gondophares, and at its greatest extent extended into areas that are in present-day Afghanistan, Pakistan and Northern India and Kushans The Kushan Empire originally formed in the 1st century CE in the territories of ancient Bactria on either side of the middle course of the Oxus River or Amu Darya in what is now northern Afghanistan, and southern Tajikistan and Uzbekistan in the north-western Indian subcontinent The Indian subcontinent, also Indian Subcontinent and other terms, is a region of the Asian continent on the Indian tectonic plate south of the Himalayas, forming a land mass which extends southward into the Indian Ocean.^[3][4][5]

From about 750 BC, the Greeks Ancient Greece is the civilization belonging to the period of Greek history lasting from the Archaic period of the 8th to 6th centuries BC to 146 BC and the Roman conquest of Greece after the Battle of Corinth. At the center of this time period is Classical Greece, which flourished during the 5th to 4th centuries BC, at first under Athenian began 250 years of expansion, settling colonies Colonies in antiquity were city-states founded from a mother-city, not from a territory-at-large. Bonds between a colony and its metropolis remained often close, and took specific forms. However, unlike in the period of European colonialism, ancient colonies were usually sovereign and self-governing from their inception in all directions. In Europe two waves of migrations dominate demographic distributions, that of the Celtic people The Celts were a diverse group of tribal societies in Iron Age and Roman-era Europe who spoke Celtic languages, and the later Migration Period The Migration period, also called the Barbarian Invasions or German: Völkerwanderung , was a period of human migration that occurred roughly between the years 300 to 700 CE in Europe, marking the transition from Late Antiquity to the Early Middle Ages. These movements were catalyzed by profound changes within both the Roman Empire and the so- from the east. Other examples are small movements like ancient Scots moving from Hibernia to Caledonia and Magyars into Pannonia (modern-day Hungary). Turkic peoples spread across most of Central Asia into Europe and the Middle East between the 6th and 11th centuries. Recent research suggests that Madagascar was uninhabited until Austronesian seafarers from Indonesia arrived during the 5th and 6th centuries AD. Subsequent migrations from both the Pacific and Africa further consolidated this original mixture, and Malagasy people emerged.^[6]

Before the expansion of the Bantu languages and their speakers, the southern half of Africa is believed to have been populated by Pygmies and Khoisan speaking people, today occupying the arid regions around the Kalahari Desert and the forest of Central Africa. By about 1000 AD Bantu migration had reached modern day Zimbabwe and South Africa. The Banu Hilal and Banu Ma'qil were a collection of Arab Bedouin tribes from the Arabian Peninsula who migrated westwards via Egypt between the 11th and 13th centuries. Their migration strongly contributed to the arabization and islamization of the western Maghreb, which was until then dominated by Berber tribes. Ostsiedlung was the medieval eastward migration and settlement of Germans. The 13th century was the time of the great Mongol and Turkic migrations across Eurasia.^[7]

Between the 11th and 18th centuries, the Vietnamese expanded southward in a process known as nam tiến (southward expansion).^[8] Manchuria was separated from China proper by the Inner Willow Palisade, which restricted the movement of the Han Chinese into Manchuria during the Qing Dynasty, as the area was off-limits to the Han until the Qing started colonizing the area with them later on in the dynasty's rule.^[9]

The Age of Exploration and European Colonialism led to an accelerated pace of migration since Early Modern times. In the 16th century perhaps 240,000 Europeans entered American ports.^[10] In the 19th century over 50 million people left Europe for the Americas.^[11] The local populations or tribes, such as the Aboriginal people in Canada, Brazil, Argentina, Australia, Japan^[12] and the United States, were usually far overwhelmed numerically by the settlers. More recent examples are the movement of ethnic Chinese into Tibet and Xinjiang^[13], ethnic Javanese into Western New Guinea and Kalimantan^[14] (see Transmigration program), Brazilians into Amazonia^[15], Israelis into the West Bank and Gaza, ethnic Arabs into Iraqi Kurdistan, and ethnic Russians into Siberia and Central Asia.^[16]

Modern migrations

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