<Tr> <Td> Edwardian </Td> <Td> 1901--1914 </Td> </Tr> <Tr> <Td> First World War </Td> <Td> 1914--1918 </Td> </Tr> <Tr> <Td> Interwar Britain </Td> <Td> 1918--1939 </Td> </Tr> <Tr> <Td> Second World War </Td> <Td> 1939--1945 </Td> </Tr>

Who became prime minister after the war ended