Used to corroborate: North-Central State 1967, Katsina separated 1987; Nok (c. 1500 BC – c. 500 AD); Hausa kingdoms; Zazzau/Zaria and Queen Amina; Sokoto Caliphate; capital moved from Zungeru to Kaduna (1916); borders; Sudan savanna; Kaduna River; Kamuku National Park; cotton and groundnuts.