Donald Trump will celebrate his Inauguration Day today, the same day as MLK Day. How many times have the two days overlapped? Here's what to know.

The U.S. is marking Martin Luther King Day, a federal holiday. But in Alabama and Mississippi, it's also Robert E. Lee Day, in honor of the Confederate general.

“With malice toward none, with charity for all, with firmness in the right, as God gives us to see the right, let us strive on to finish the work we are in, to bind up the nation’s wounds.” -- Abraham Lincoln, March 4, 1865.