Answer:
His name was " Herodotus "
This question can have many answers but ill try to answer it in the north slaves werent profitable so most northerners didnt have slaves and eventually slavery was seen as morally wrong in the north so in the south once abraham lincoln became president the south became its own coutry and the civil war began so after the north won slavery was abolished in the south.
The answer is (a.), Mahayana Buddhism is beliefs system did the win dynasty. Hope it helped you, and have a great day!
-Charlie