"Growing up in the late 19th century, Laura Wheeler Waring didn't see any artists who looked like her. She didn't see any paintings of people who looked like her, either. So when she was offered a commission to paint portraits of accomplished African Americans, she jumped at the chance. Writers, singers, political activists, and thinkers all posed for her. Now her portraits hang in Washington, D.C.'s National Portrait Gallery, where children of all...