Collective memory 24 Social aspects 22 Memory 18 Psychological aspects 8 History 7 Mass media and culture 6 Historiography 4 Mass media 4 Nostalgia 4 Cultural assimilation 3 Immigrants 3 Mass media and history 3 Memorialization 3 Museums 3 Political aspects 3 Sociological aspects 3 Americans 2 Foreign public opinion, American 2 Memorials 2 Memory in literature 2 Memory on television 2 Museum techniques 2 Nationalism 2 Nostalgia on television 2 Philosophy 2 Shanghai (China) 2 Television 2 Television and history 2 Australia Day 1 Bloody Sunday, Derry, Northern Ireland, 1972 1