The Settlers franchise used to be big in America, if not quite the hit it has always been in Germany. The first few Settlers games were modest hits that were quite different from the usual city building/RTS fare. The game was more about efficient resource collection than collection alone. You gathered basic goods which are then processed into more advanced goods which unlock other things, etc. with the key consideration being that you don't want goods sitting around not being used but you also don't want to have to wait for them to be made. Wasteful overproduction is to be avoided. Oh, and then you build an army and kill some guys.