1017 20thcentury 6406 7541 africanhistory colonialism europeanhistory general history militaryhistory mnt modernhistory p0040004 p0040211 p0040220 p0040235 p0041025 p1031004 p1031012 post-colonialism sc721000 sc911090 socialsciences suco41172 suco41174 sus tr worldwari