Metropolitan areas -- Urbanization -- 2 20th century 1 COVID-19 (Disease) 1 Case studies 1 Cities and towns -- 1 Community development -- 1 more ... Economic aspects 1 Growth -- 1 Metropolitan government -- 1 Political aspects 1 Regional planning 1 Social aspects 1 Social conditions 1 Sociology,urban 1 Sustainable development 1 Urban climatology 1 Urban economics 1 World politics -- 1 less ...