ハウサ諸王国
The Hausa Kingdom, also known as Hausa Kingdoms or Hausaland, was a collection of states started by the Hausa people, situated between the Niger River and Lake Chad (modern day northern Nigeria). Hausaland lay between the Western Sudanic kingdoms of Ancient Ghana and Mali and the Eastern Sudanic kingdoms of Kanem-Bornu. Hausaland took shape as a political and cultural region during the first millennium CE as a result of the westward expansion of Hausa peoples. They arrived to Hausaland when the terrain was converting from woodlands to savannah. They started cultivating grains, which led to a denser peasant population. They had a common language, laws, and customs. The Hausa were known for fishing, hunting, agriculture, salt-mining, and blacksmithing.