<Tr> <Td> Roman Gaul </Td> <Td> 50 BC--486 AD </Td> </Tr> <Tr> <Td> Early Middle Ages (show) <Table> <Tr> <Td> Franks </Td> <Td> </Td> </Tr> <Tr> <Td> Merovingians </Td> <Td> 481--751 </Td> </Tr> <Tr> <Td> Carolingians </Td> <Td> 751--987 </Td> </Tr> </Table> </Td> </Tr> <Table> <Tr> <Td> Franks </Td> <Td> </Td> </Tr> <Tr> <Td> Merovingians </Td> <Td> 481--751 </Td> </Tr> <Tr> <Td> Carolingians </Td> <Td> 751--987 </Td> </Tr> </Table> <Tr> <Td> Franks </Td> <Td> </Td> </Tr>

What were the main reasons which caused france to industrialize