Nicholas Mulder’s new book, “The Economic Weapon: The Rise of Sanctions as a Tool of Modern War,” remakes debates over European history between the two world wars. It rescues the League of Nations from the enormous condescension of posterity, arguing that the league was neither ridiculous nor doomed. However, it also demonstrates that the league’s ...

What exactly was the extent of Russian meddling in the 2016 election campaign? How widespread was its infiltration of social media? And how much influence did its propaganda have on public opinion and voter behavior? Scholars are only now starting to tackle those questions. But to answer them, academics need data — and getting that ...