1810-1856 1892-1971 1904- 1904-1980 1924- 1924-2013 1939-1945 20thcentury criticismandinterpretationschumann german history kennethneal köhler liste moralandethicalaspects morgenthau niebuhr nuclearwarfare personalnarratives philosophy politicalandsocialviewsschädlich politicalaspects realism reinhold robert waltz worldpolitics worldwar