Atomic bomb -- History -- 2 20th century. -- 1 21st century. -- 1 Blast effect -- 1 Bombardment, 1945 1 Executive power -- 1 more ... Foreign relations -- 1 History 1 History. -- 1 Military policy 1 Natinal security -- 1 National security -- 1 Political aspects -- 1 World War, 1939-1945 -- 1 less ...