<Table> Slaves imported into Colonial America <Tr> <Th> 1620--1700 </Th> <Th> 1701--1760 </Th> <Th> 1761--1770 </Th> <Th> 1771--1780 </Th> <Th> total </Th> </Tr> <Tr> <Td> 21,000 </Td> <Td> 189,000 </Td> <Td> 63,000 </Td> <Td> 15,000 </Td> <Td> 287,000 </Td> </Tr> </Table> <Tr> <Th> 1620--1700 </Th> <Th> 1701--1760 </Th> <Th> 1761--1770 </Th> <Th> 1771--1780 </Th> <Th> total </Th> </Tr> <Tr> <Td> 21,000 </Td> <Td> 189,000 </Td> <Td> 63,000 </Td> <Td> 15,000 </Td> <Td> 287,000 </Td> </Tr> <P> The numbers grew rapidly through a very high birth rate and low mortality rate, reaching nearly four million by the 1860 census . From 1770 until 1860, the rate of natural growth of North American slaves was much greater than for the population of any nation in Europe, and was nearly twice as rapid as that in England . </P>

What group and regional identities emerged in the thirteen british colonies