NEWYou can now listen to Fox News articles! That’s the impression you would get if you visited the exhibit on Entertainment Nation at the American History Museum on the National Mall — the Smithsonian Institution’s flagship museum that explains to between 2 million and 4 million visitors every year what America is all about, and why.You won’t find any permanent exhibit on the Founding Fathers or the signing of the Declaration of Independence.But you will find a display that claims one of America’s most beloved and iconic cartoon characters, Mickey Mouse, was actually inspired by blackface minstrelsy — an entertainment...