I never read this in my high school history

From The Washington Times: "An American historian says that more than a million Europeans were enslaved by North African slave traders between 1530 and 1780, a time of vigorous Mediterranean and Atlantic coastal piracy.
The number of white European slaves is only a fraction of the trade that brought 10 million to 12 million black African slaves to the Americas over a 400-year period, historian Robert Davis says, but his research shows the slave trade was more widespread than commonly assumed. The impact on Europe's white population was significant."