20 centuary By Ana15j 1914 first world war 1917 russian revolution 1928 discovery of penicillin 1929 great depression 1936 spanish civil war 1939 Second World War 1943 cold war 1945 atomic bombing 1949 chinese revolution 1953 chinese revolution 1955 vietnam war 1969 man landing on the moon 1980 iran war - iraq 1986 nuclear accident 1989 nuclear accident
