On November 19, 1863—exactly 150 years ago to this day—U.S. President Abraham Lincoln gave his historic “Gettysburg Address,” known for its famous lines: “Four score and seven years ago our fathers brought forth, upon this continent, a new nation, conceived in liberty, and dedicated to the proposition that all men are created equal.” Despite his lofty words, Lincoln understood that this proposition—like the nation as a whole—was being tested. What about today?