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Tagsaction spaces Africa african language age sex ratio Balto-Slavic buddhism caribbean central place theory Ch. 4 Ch.6 Ch. 8 Ch. 9 Ch. 10 Ch. 11 Ch. 13 chain migration concentration country crude death rate Cuba cultural diffusion declining birth rate demographics dependency ratio devolution distribution ecumene english ethnic conflict ethnic group ethnic groups ethnic identity external migration family planning fertility filtering GDP ghettoization guest workers IMR internal migration languages LDC Malthus map links maps mercator mobility model nationalism nature band-aid net in net out NIR pattern phrenology physiological density pidgin Pop Culture popular culture population population distribution possibilism profile projection push/pull factors push factor quiz race range reasons for migrating refugees region rubenstein services slums Somalua squatter settlement suburbia supranationalism TFR urban design urban structure model world