Much of history would be lost forever if it wasn't written down. Doing it by hand is tedious and not very consistent. Besides the ink fades off over time with some cases. With the printing press, it's much more clear and consistent to read. Also the printing press allowed for anyone to get access to books. Before it was the elite that could only get access.
Your answers are Gana, Mali, and Songhai.
Answer:
The rise of the Roman and Chinese empires were arduous and lengthy processes that took at least four centuries. In the eighth century BCE, the geopolitics of eastern Asia was similar to that of the eastern Mediterranean, which was populated by hundreds of tiny Greek city-states. Five years after the Greeks gathered for their first Olympic Game in 776 BCE, the host of centuries-old city-sized feudal states in China received a new company, Qin, the future empire builder. Eighteen years after the investiture of Qin, tradition had it that Rome was founded on the hills beside the River Tiber. The legend’s veracity is much questioned, but it was around this time that the Greek and Phoenician colonizers brought the model of city-state to the western Mediterranean and founded Carthage, Rome’s future arch enemy. The foundation of the Republic in 509 BCE was undoubtedly a turning point in Rome’s history. It too, found itself among a host of city-states in Italy.
Explanation:
Electric field potential, potential drop, or the electrostatic potential
