Yohanan ben Zaccai was the one who founded a school that became a center for torah studies. Johanan Ben Zakkai was a first-century CE disciple of Hillel
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Innovations of Emperor Shi Huangdi
Qin Shi Huang standardized writing, a crucial factor in the overcoming of cultural barriers between provinces, and unifying the empire. He also standardized systems of currency, weights, and measures, and conducted a census of his people.
State in medieval Europe (During the 11th & 12th centuries)
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The Hausa states were exhausted economically because of internal and external constant wars. It was taken over by the Kanem-Bornu after the conquest of Usuman dan Fodio.
The location of Kanem-Bornu was at the center of African continent which is now part of Chad and Nigeria. The special geopolitical position attracted trades and the empire actually lied on the famous trans-Saharan trade route, that contributed to its power.
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