Joe Biden is now the 46th president of the United States, and Donald Trump becomes a figure in history. But where and how does Trump fit into that history? Ruth Ben-Ghiat, professor of history and Italian studies at New York University, explains that Trump now defines a new kind of media-savvy — but ultimately failed — strongman leader. She is the author of Strongmen: From Mussolini to the Present. "Trump is a 21st century strongman. He’s a showman and manipulator," says Ben-Ghiat. "Trump mastered misinformation and connecting emotionally with people...But his populist stuff was just B.S."