Keywords: African Americans Social conditions ; 20th century ; Washington (D.C.) ; African Americans Social life and customs ; 20th century ; Washington (D.C.) ; Inner cities History ; 20th century ; Washington (D.C.) ; Community life History ; 20th century ; Washington (D.C.) ; African Americans Washington D.C. ; Social conditions ; 20th century ; African Americans Washington D.C. ; Social life and customs ; 20th century ; Inner cities Washington D.C. ; History ; 20th century ; Community life Washington D.C. ; History ; 20th century ; Washington (D.C.) Race relations ; Washington (D.C.) Social conditions ; 20th century ; Washington (D.C.) Race relations ; Washington (D.C.) Social conditions ; 20th century ; Washington, DC ; Getto ; Kultur ; Washington, DC ; Getto ; Kultur ; Schwarze ; Washington, DC ; Getto ; Kultur ; Washington, DC ; Getto ; Kultur ; Schwarze

Keywords: Architektur ; Dom ; Geometrie ; Maßsystem ; Sakralbau ; Architecture, Gothic ; Cathedrals ; Church architecture ; Geometry in architecture ; Dom ; Geometrie ; Geschichte 900-1500