Africa's most populous city not on a navigable body of water; its settlers didn't need water when they had gold
They had elaborate irrigation systems to draw water away from rivers 
to .... After the settlers began to grow their own food, the Indians were useless, 
and... [DOC] [TLE] THE STRUCTURE OF TRANSPORTATION REVOLUTIONS [PAR] Jan 12, 2005 ... First of all, they inevitably have a social dimension.