Casemiro celebrates after United defeated Manchester City. For years, Manchester United ruled over English football, collecting 13 Premier League trophies between 1992 and 2013, as well as the world’s best players and legions of fans. But since the retirement of legendary manager Alex Ferguson in 2013, United fans have watched their kingdom crumble, as another was being built across town at Manchester City. But a 2-1 victory on Saturday over City, albeit in controversial circumstances, has suddenly placed Manchester United in the Premier League title race and seemed to confirm a resurgence at last for United fans. Now, their team has won 12 of its last 13 games in all competitions and is on a run of nine consecutive victories, after a poor start to the season in which it was bottom of the table at one point, and obliterated by City 6-3 in October. So what is behind the resurgence of one of the world’s biggest clubs? Erik ten Hag Since Ferguson retired in May 2013, United have cycled th...