RUSSIAN ACADEMY OF SCIENCES INSTITUTE OF ORIENTAL STUDIES Eurasian Center for Big History & System Forecasting SOCIAL EVOLUTION Studies in the Evolution & HISTORY of Human Societies Volume 20, Number 1 / March 2021 DOI: 10.30884/seh/2021.01.00 Contents Articles: Fábio Portela Lopes de Almeida The Darwinian Multilevel Selection of Constitutionalism as a Societal Structure .................................................................................. 3 Francis David Lankester Egypt: From Upper Egyptian Rural Petty Polities to Territorial Unitary State ...................................................................... 37 Sergey V. Dobrolyubov The Two-Factor (Authority-Solidarity) Model of Society's Structural Cycles in the Evolutionary Perspective ............................. 65 Olukayode A. Faleye Explaining Disease: A Chapter in Nigerian Historiography ............. 94 Yuzanna Azikova Kinship and Territorial Ties within the Power System of the Traditional Kabardian Society ........................................................... 114 Hoyoon Jung Building the Brazilian Nation through Futebol-Mulato: Racial Democracy, Visual-Aural Capitalism and the Rise of Cultural Citizenship in Twentieth-Century Brazil .......................................... 146 Sergei Nefedov and Michael Ellman Excess Mortality in Russia in 1868–1912 and Its Historiographic Implications .......................................................................................... 173