History 24 Holocaust, Jewish (1939-1945) 20 World War, 1939-1945 13 Atrocities 8 Holocaust survivors 6 Concentration camps 5 Genocide 4 more ... Jews 3 Psychological aspects 3 September 11 Terrorist Attacks, 2001 3 Social aspects 3 Transgender people 3 Women 3 Attitudes 2 Conservation projects (Natural resources) 2 Disaster relief 2 Economic conditions 2 Ethnic relations 2 Foreign relations 2 Japanese Americans 2 Jewish resistance 2 Marketplaces 2 Mentally ill 2 Moral and ethical aspects 2 Nazis 2 Peacekeeping forces 2 Persecutions 2 Persian Gulf War, 1991 2 Psychology 2 Social life and customs 2 less ...