<Table> <Tr> <Td_colspan="3"> Democratic Republic of Vietnam </Td> </Tr> <Tr> <Td_colspan="3"> Việt Nam Dân chủ Cộng hòa </Td> </Tr> <Tr> <Td_colspan="3"> <Table> <Tr> <Td> </Td> <Td> 1945--1976 </Td> <Td> </Td> </Tr> </Table> </Td> </Tr> <Tr> <Td_colspan="3"> Flag Emblem </Td> </Tr> <Tr> <Td_colspan="3"> Motto "Độc lập--Tự do--Hạnh phúc" (English: "Independence--Freedom--Happiness") </Td> </Tr> <Tr> <Td_colspan="3"> Anthem "Tiến Quân Ca" (English: "Army March") </Td> </Tr> <Tr> <Td_colspan="3"> Location of North Vietnam in Southeast Asia . </Td> </Tr> <Tr> <Td_colspan="2"> Capital </Td> <Td> Hanoi </Td> </Tr> <Tr> <Td_colspan="2"> Languages </Td> <Td> Vietnamese (official) </Td> </Tr> <Tr> <Td_colspan="2"> Government </Td> <Td> Unitary Marxist--Leninist one - party socialist republic </Td> </Tr> <Tr> <Td_colspan="2"> Party Chairman First Secretary </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> 1945--1956 </Td> <Td> Trường Chinh </Td> </Tr> <Tr> <Td> </Td> <Td> 1956--1960 </Td> <Td> Hồ Chí Minh </Td> </Tr> <Tr> <Td> </Td> <Td> 1960--1976 </Td> <Td> Lê Duẩn </Td> </Tr> <Tr> <Td_colspan="2"> President </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> 1945--1969 </Td> <Td> Hồ Chí Minh </Td> </Tr> <Tr> <Td> </Td> <Td> 1969--1976 </Td> <Td> Tôn Đức Thắng </Td> </Tr> <Tr> <Td_colspan="2"> Prime Minister </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> 1945--1955 </Td> <Td> Hồ Chí Minh </Td> </Tr> <Tr> <Td> </Td> <Td> 1955--1976 </Td> <Td> Phạm Văn Đồng </Td> </Tr> <Tr> <Td_colspan="2"> Historical era </Td> <Td> Cold War Vietnam War </Td> </Tr> <Tr> <Td> </Td> <Td> Republic declared </Td> <Td> September 2, 1945 </Td> </Tr> <Tr> <Td> </Td> <Td> Viet Minh reenters Hanoi </Td> <Td> October 10, 1954 </Td> </Tr> <Tr> <Td> </Td> <Td> PAVN enters Saigon </Td> <Td> April 30, 1975 </Td> </Tr> <Tr> <Td> </Td> <Td> North and South Vietnam merged </Td> <Td> July 2, 1976 </Td> </Tr> <Tr> <Td_colspan="3"> Area </Td> </Tr> <Tr> <Td> </Td> <Td> 1960 </Td> <Td> 157,880 km (60,960 sq mi) </Td> </Tr> <Tr> <Td_colspan="3"> Population </Td> </Tr> <Tr> <Td> </Td> <Td> 1960 est . </Td> <Td> 15,916,955 </Td> </Tr> <Tr> <Td_colspan="2"> Density </Td> <Td> 101 / km (261 / sq mi) </Td> </Tr> <Tr> <Td> </Td> <Td> 1974 est . </Td> <Td> 23,767,300 </Td> </Tr> <Tr> <Td_colspan="2"> Density </Td> <Td> 151 / km (390 / sq mi) </Td> </Tr> <Tr> <Td_colspan="2"> Currency </Td> <Td> đồng cash (until 1948) </Td> </Tr> <Tr> <Td_colspan="3"> <Table> <Tr> <Td> Preceded by </Td> <Td> Succeeded by </Td> </Tr> <Tr> <Td> <Table> <Tr> <Td> </Td> <Td> French Indochina </Td> </Tr> <Tr> <Td> </Td> <Td> Empire of Vietnam </Td> </Tr> </Table> </Td> <Td> <Table> <Tr> <Td> Vietnam </Td> <Td> </Td> </Tr> </Table> </Td> </Tr> </Table> </Td> </Tr> <Tr> <Td_colspan="2"> Today part of </Td> <Td> Vietnam </Td> </Tr> </Table> <Tr> <Td_colspan="3"> Democratic Republic of Vietnam </Td> </Tr>

What was the capital of north vietnam in the mid 1950s