<Tr> <Td_colspan="2"> Legislature </Td> <Td> Reichstag </Td> </Tr> <Tr> <Td> </Td> <Td> Federal Council </Td> <Td> Bundesrat </Td> </Tr> <Tr> <Td_colspan="2"> Historical era </Td> <Td> New Imperialism / First World War </Td> </Tr> <Tr> <Td> </Td> <Td> Unification </Td> <Td> 18 January 1871 </Td> </Tr>

What happened to the german empire after ww1