Answer:
It is hard to give only one cause to such a big historical event. The decay of empires can be a long duration event with a dozen of causes. However in this case it is safe to say that this set of events has one common fundamental cause: transatlantic slave trade.
Explanation:
The transatlantic slave trade was a long duration event that completely changed internal dynamics of African empires. Although to say that it destroyed Africa's cultural achievements is too much, it certainly impacted the entire continent.
Africa had internal slave trade since long time before the 14th century. This trade however was small and connected with demands internal to states in the continent. When the atlantic trade started and became routine it was big business, the bigger of the modern era: it was a world trade that was responsible for much of the growing of many entire nations.
The last country to abolish slavery was Brazil in 1888. Transatlantic slave trade started in the 1400s with technological developments that improved navegation and ended in mid 1800s.
Demosthenes, the traditional freedom city of <u>Athens</u>, gave a warning to the southern states of Greek people affected by the policies of Philip.
<h3>Who was Demosthenes?</h3>
Demosthenes was a statesman, speech writer, and orator in the ancient era of the Greeks.
Demosthenes warned the people of Athens from the king of Persia named Philip. His view was that if the Athenians avoided the policies being imposed by Philip on them, then there could be occurred a big disaster that destroyed the freedom of the city of Athens.
Therefore, the people of Athens were warned by Demosthenes against the practices of king Philip.
Learn more about the Demosthenes in the related link:
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The reunification of Japan is accomplished by three strong daimyo who succeed each other: Oda Nobunaga (1543-1582), Toyotomi Hideyoshi (1536-1598), and finally Tokugawa Ieyasu (1542-1616) who establishes the Tokugawa Shogunate, that governs for more than 250 years, following the Battle of Sekigahara in 1600.