An investigation into slavery in Mauritania:

An estimated 10% to 20% of Mauritania’s 3.4 million people are enslaved — in “real slavery,” according to the United Nations’ special rapporteur on contemporary forms of slavery, Gulnara Shahinian. If that’s not unbelievable enough, consider that Mauritania was the last country in the world to abolish slavery. That happened in 1981, nearly 120 years after Abraham Lincoln issued the Emancipation Proclamation in the United States. It wasn’t until five years ago, in 2007, that Mauritania passed a law that criminalized the act of owning another person. So far, only one case has been successfully prosecuted.

Like hundreds of other local slaves — [they] had been pressed into service by the Confederates, compelled to build an artillery emplacement amid the dunes across the harbor. They labored beneath the banner of the 115th Virginia Militia, a blue flag bearing a motto in golden letters: “Give me liberty or give me death.”

Today, Abraham Lincoln’s struggle with clinical depression would make him “unfit for office.” Back then, it was the key to his presidency.