<Tr> <Th> Geographical range </Th> <Td> Near East - Middle East </Td> </Tr> <Tr> <Th> Period </Th> <Td> Late Neolithic - Middle Bronze Age </Td> </Tr> <Tr> <Th> Dates </Th> <Td> c. 4500--c. 1900 BC </Td> </Tr> <Table> <Tr> <Th> Part of a series on the </Th> </Tr> <Tr> <Th> History of Iraq </Th> </Tr> <Tr> <Td> </Td> </Tr> <Tr> <Th> Ancient Mesopotamia </Th> </Tr> <Tr> <Td> <Ul> <Li> Sumer </Li> <Li> Assyria </Li> <Li> Akkadian Empire </Li> <Li> Babylonia </Li> <Li> Neo-Assyrian Empire </Li> <Li> Neo-Babylonian Empire </Li> <Li> Median Kingdom </Li> </Ul> </Td> </Tr> <Tr> <Th> Classical antiquity </Th> </Tr> <Tr> <Td> <Ul> <Li> Achaemenid Assyria </Li> <Li> Seleucid Babylonia </Li> <Li> Parthian Babylonia </Li> <Li> Roman Mesopotamia </Li> <Li> Sasanian Asorestan </Li> </Ul> </Td> </Tr> <Tr> <Th> Middle Ages </Th> </Tr> <Tr> <Td> <Ul> <Li> Islamic conquest </Li> <Li> Rashidun Caliphate </Li> <Li> Umayyad Caliphate </Li> <Li> Abbasid Caliphate </Li> <Li> Hamdanids </Li> <Li> Buyid amirate of Iraq </Li> <Li> Marwanids </Li> <Li> Uqaylids </Li> <Li> Al - Mazeedi </Li> <Li> Ayyubids </Li> <Li> Seljuk Empire </Li> <Li> Zengids </Li> <Li> Ilkhanate </Li> <Li> Jalairid Sultanate </Li> <Li> Kara Koyunlu </Li> <Li> Aq Qoyunlu </Li> </Ul> </Td> </Tr> <Tr> <Th> Early modern period </Th> </Tr> <Tr> <Td> <Ul> <Li> Safavids </Li> <Li> Ottoman Iraq </Li> <Li> Mamluk dynasty </Li> </Ul> </Td> </Tr> <Tr> <Th> Modern Iraq </Th> </Tr> <Tr> <Td> <Ul> <Li> Mandatory Iraq </Li> <Li> Kingdom of Iraq </Li> <Li> Republic (1958--68) </Li> <Li> Ba'athist rule (1968--2003) </Li> <Li> Occupation (2003--11) </Li> <Li> Recent history </Li> </Ul> </Td> </Tr> <Tr> <Td> Iraq portal </Td> </Tr> <Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> </Table>

When did the sumer civilization begin and end