The federal holiday celebrating George Washington’s birthday no longer falls on Washington’s birthday, which is one of the reasons it’s now better known as “Presidents’ Day.” Washington, who was born Feb. 22, 1732, had the holiday all to himself from 1885 until 1971, when it was moved to the third Monday in February to ensure a three-day weekend. That led many Americans to believe the holiday now honored Washington and Abraham Lincoln (born Feb. 12, 1809). Businesses looking for ways to market the holiday soon began calling it “Presidents’ Day,” and the rest, as they say, is history. So, while it’s still officially Washington’s Birthday, we now unofficially honor all US presidents on this holiday, while also getting big discounts on mattresses. To some, it’s dishonoring to lump Washington in with the likes of John Tyler, Richard Nixon and Warren Harding. On the other hand, expanding the scope allows us to recognize the merits of Lincoln and others. In that spirit, we present this test of your presidential knowledge …