History of Africa usually governed by an "oba" and an "iwarefa", a council of chiefs who advised the "oba." by the 18th century, the Yoruba city-states formed a loose confederation, with the "Oni" of Ife as the head and Ife as the capital. As time went on, the individual city-states became more powerful with their "obas" assuming more powerful spiritual positions and diluting the authority of the "Oni" of Ife. Rivalry became intense among the city-states. The Oyo Empire rose in the 16th century. The Oyo state had been conquered in 1550 by the kingdom of Nupe, which was in possession of cavalry,
18th-century history of Germany 18th-century history of Germany From the 1680s to 1789, Germany comprised many small territories which were parts of the Holy Roman Empire of the German Nation. Prussia finally emerged as dominant. Meanwhile, the states developed a classical culture that found its greatest expression in the Enlightenment, with world class leaders such as philosophers Leibniz and Kant, writers such as Goethe and Schiller, and musicians Bach and Beethoven. Germany, or more exactly the old Holy Roman Empire, in the 18th century entered a period of decline that would finally lead to the dissolution of the Empire during the Napoleonic Wars. Since