<Table> <Tr> <Th> Part of a series on the </Th> </Tr> <Tr> <Th> History of Berlin </Th> </Tr> <Tr> <Td> </Td> </Tr> <Tr> <Th> Margraviate of Brandenburg (1157--1806) </Th> </Tr> <Tr> <Th> Kingdom of Prussia (1701--1918) </Th> </Tr> <Tr> <Th> German Empire (1871--1918) </Th> </Tr> <Tr> <Th> Weimar Republic (1919--1933) </Th> </Tr> <Tr> <Td> <Ul> <Li> 1920s Berlin </Li> <Li> Greater Berlin Act </Li> </Ul> </Td> </Tr> <Tr> <Th> Nazi Germany (1933--1945) </Th> </Tr> <Tr> <Td> <Ul> <Li> Welthauptstadt Germania </Li> <Li> Bombing of Berlin in World War II </Li> <Li> Battle of Berlin </Li> </Ul> </Td> </Tr> <Tr> <Th> West Germany and East Germany (1945--1990) </Th> </Tr> <Tr> <Td> <Ul> <Li> West Berlin and East Berlin </Li> <Li> Berlin Wall </Li> <Li> Berlin Blockade (1948--1949) </Li> <Li> Berlin Crisis of 1961 </Li> <Li> "Ich bin ein Berliner" (1963) </Li> <Li> "Tear Down This Wall" (1987) </Li> </Ul> </Td> </Tr> <Tr> <Th> Federal Republic of Germany (1990--present) </Th> </Tr> <Tr> <Td> <Ul> <Li> History of Germany and History of Europe </Li> </Ul> </Td> </Tr> <Tr> <Th> See also </Th> </Tr> <Tr> <Td> <Ul> <Li> Timeline of Berlin </Li> </Ul> </Td> </Tr> <Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> </Table> <Tr> <Th> Part of a series on the </Th> </Tr> <Tr> <Th> History of Berlin </Th> </Tr>

Why did the us airlift supplies into berlin