<Tr> <Td> </Td> <Td> Schaumburg - Lippe </Td> <Td> Bückeburg </Td> </Tr> <Tr> <Td> </Td> <Td> Schwarzburg - Rudolstadt </Td> <Td> Rudolstadt </Td> </Tr> <Tr> <Td> </Td> <Td> Schwarzburg - Sondershausen </Td> <Td> Sondershausen </Td> </Tr> <Tr> <Td> </Td> <Td> Waldeck and Pyrmont (Waldeck und Pyrmont) </Td> <Td> Arolsen </Td> </Tr>

Briefly explain the process of unification of germany