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"World leaders" redirects here. For the CIA-published public domain directory, see World Leaders.

This is a list of current heads of state and heads of government. In some cases, mainly in presidential systems, there is only one leader being both head of state and head of government. In other cases, mainly in semi-presidential and parliamentary systems, the head of state and the head of government are different people. In semi-presidential and parliamentary systems, the head of government role (i.e. executive branch) is fulfilled by both the listed head of government and the head of state.

The list includes the names of recently elected or appointed heads of state and government who will take office on an appointed date, as presidents-elect and prime ministers-designate, and those leading a government in exile if internationally recognised.

early human migrations are the earliest migrations and expansions of archaic and modern humans across continents and are believed to have begun approximately 2 million years ago with the out of africa migration of homo erectus. this initial migration was followed by other archaic humans including h. heidelbergensis, which lived around 500,000 years ago and was the likely ancestor of both denisovans and neanderthals. early hominids were said to have "crossed land bridges that were eventually covered in water" .

within africa, homo sapiens dispersed around the time of its speciation, roughly 300,000 years ago.the "recent african origin" paradigm suggests that the anatomically modern humans outside of africa descend from a population of homo sapiens migrating from east africa roughly 70,000 years ago and spreading along the southern coast of asia and to oceania before 50,000 years ago. modern humans spread across europe about 40,000 years ago.

the migrating modern human populations are known to have interbred with local varieties of archaic humans, so that contemporary human populations are descended in small part (below 10% contribution) from regional varieties of archaic humans.

after the last glacial maximum, north eurasian populations migrated to the americas about 20,000 years ago. northern eurasia was peopled after 12,000 years ago, in the beginning holocene. arctic canada and greenland were reached by the paleo-eskimo expansion around 4,000 years ago. finally, polynesia was peopled after 2,000 years ago, by the austronesian expansion.

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