United had to at least draw to keep the title race mathematically alive but they were stunned at Old Trafford when Jay Rodriguez headed home after the break.
He would have been as surprised as everyone else that the title, seemingly a foregone conclusion for months, was rubber-stamped in such unusual circumstances.
"We didn't want or played simple, everything was slow, one more flick, trick, turn".
As for City, it has a month to finish a season with the most points, goals and wins in a single Premier League campaign.
United will have to battle for second place with Liverpool who are just a point behind but have a game at hand. "They do great pressing and have a lot of talented players, like [Mousa] Dembele, [Jan] Vertonghen, Dele Alli, [Christian] Eriksen, Son [Heung-min] and [Harry] Kane is their top scorer". You didn't expect City to beat the Invincibles, did you?
It is the team's first league title since 2014.
More importantly, though, it means Pep Guardiola's City team can not now be caught at the top of the table, thus handing the Catalan coach his first Premier League crown in just his second year in English football.
After a mixed first season in England, Guardiola faced questions about whether his methods were a good fit for the Premier League.
Not only that but he did it with five games remaining, equalling the English top-flight record of United (1907-08 and 2000-01) and Everton (1984-85).
Most of their goals this season have come with a flourish, but for once City took a more direct approach.
"But I don't have the feeling that we missed out on what we wanted to do or that we failed". "We have spent a lot of money to have these awesome players, to make that possible".
Pogba's form, particularly since the January signing of Alexis Sanchez, has been one of the fascinating sub-plots of United's season with the player reportedly unhappy at the defensive responsibilities he has been asked to perform.
"Winning the Premier League is going to be one of the best three seasons I have ever had as a player and as a manager". We've got a final against Chelsea at the start of May which extends the season and gives us another showpiece game.
After by a distance their worst week of the season as City blew the chance to seal the title on home soil against United and were dumped out of the Champions League quarter-finals 5-1 on aggregate by Liverpool, they showed why they are champions by bouncing back against Spurs at Wembley. "You can't describe it. They lost only two matches [this season] because they were the best team", Mourinho said.