The ▁Land " ▁– ▁A ▁term ▁origin ating ▁in ▁Cleveland - made ▁hip - h op ▁music ▁in ▁the ▁ 1 9 9 0 s , ▁and ▁became ▁popular ▁in ▁the ▁national ▁media ▁in ▁the ▁mid ▁ 2 0 1 0 s ▁ ▁" Met ropol is ▁of ▁the ▁Western ▁Reserve " ▁– ▁A ▁ 1 9 th ▁Century ▁nick name ▁for ▁the ▁City ▁of ▁Cleveland ▁ ▁" The ▁M ist ake ▁on ▁the ▁Lake " ▁– ▁A ▁pe jor ative ▁term ▁for ▁the ▁city , ▁origin ating ▁from ▁the ▁ 1 9 6 0 s ▁" The ▁New ▁American ▁City " ▁ ▁" The ▁Rock ▁and ▁Roll ▁Capital ▁of ▁the ▁World " ▁– ▁Origin ated ▁in ▁early ▁ 1 9 7 0 s . ▁ ▁Ref ers ▁to ▁Cleveland ' s ▁association ▁with ▁rock ▁and ▁roll ▁music . ▁ ▁Today , ▁Cleveland ▁is ▁home ▁of ▁the ▁Rock ▁and ▁Roll ▁Hall ▁of ▁Fame . ▁ ▁" S ix th ▁City " ▁- ▁An ▁early ▁ 2 0 th ▁century ▁nick name ▁due ▁to ▁Cleveland ▁being ▁the ▁sixth ▁largest ▁city ▁at ▁the ▁time ▁ ▁See ▁also ▁▁ ▁List ▁of ▁city ▁nick names ▁in ▁Ohio ▁ ▁List s ▁of ▁nick names ▁– ▁nick name ▁list ▁articles ▁on ▁Wikipedia ▁ ▁References ▁ ▁Cleveland ▁Category : Culture ▁of ▁Cleveland ▁Nick names ▁for ▁Cleveland ▁Category : Names ▁of ▁places ▁in ▁the ▁United ▁States <0x0A> </s> ▁In ▁the ▁mathematics ▁of ▁graph ▁drawing , ▁Tur án ' s ▁brick ▁factory ▁problem ▁asks ▁for ▁the ▁minimum ▁number ▁of ▁cross ings ▁in