It is from Crash Course World History. It is at around 8 minute and 13 second. Here it goes:
Napoleon had plans to reconstruct France's empire in North America that it had lost most of in the 7 Years War, and to do this he needed tons of money from France's most valuable colony, Saint-Domingue. And the best way to maximize profits? Why, to reintroduce slavery, of course.
Did the presenter mean why not to reintroduce...?