Short answers, pulled from the story.
The Venus of Brassempouy stands as the earliest known real likeness of a human face, carved from mammoth ivory roughly 25,000 years ago. This ancient artifact demonstrates that humans have ornamentally carved animal teeth since prehistoric times.
North Africa provided sources before sub-Saharan Africa became the main source from the 18th century onward. Eurasian elephant ivory was usually obtained from tusks in India during Roman times.
Darius I inscribed that raw material was brought from Nubia in Africa and South Asia for use in his Palace of Susa. Chryselephantine sculptures mixed ivory flesh parts with gilded clothed materials for important cult statues like Athena Parthenos by Phidias.
The Pyxis of al-Mughira dates to 968 and was likely constructed in workshops of Madinat al-Zahra palace in Cordoba Spain. Umayyad caliphate promoted Islam through art architecture and political authority using ivory caskets as symbols of endurance.
U.S. Interior Department announced ban on elephant ivory trade within United States by February 2014 prohibiting imports exports resales. Donald Trump lifted ban on ivory imports from Zimbabwe implemented by Barack Obama on the 16th of November 2017.