Chelsea won the league by a single point after both clubs won on the final day, with Ancelotti's men thrashing a hapless, ten-man Wigan Athletic side 8-0.
Home and away victories against Sir Alex Ferguson's side, who were looking for an unprecedented fourth successive title, kept Chelsea in front.
"The key point, I think, was our victory at home and also, above all, in Manchester,'' declared Ancelotti. "They were the key for this title because that improved our confidence and sent United a little bit down.''
Chelsea, who head to Wembley on Saturday to face Portsmouth in the FA Cup final looking for their first ever Double, may have the oldest squad ever to win the Premier League title, but Ancelotti does not believe that should cause any concern for long-term success at Stamford Bridge.
In fact, Ancelotti is planning for a dynasty of his own at Chelsea.
"I think that this club will have a future because these players are not so old and we have a very good squad, for next year and the years after,'' he added. "We had a fantastic season, not only by winning the Premier League but because we showed a good style on the pitch. After the first year, I hope to stay here a long time and win a lot of titles.
"We closed the season very well with a fantastic performance I think that, at the start of this match, there was a bit of pressure on us and we didn't play so well. But we played much better in the second half. We played a good match and won, and that was our aim.
"To win this game and close this title. We are very happy and I want to say a lot of thanks: to my owner, Roman Abramovich; to my club and everyone who worked with me in this season, supporting me every day; and above all my players.
"I found a fantastic team here who worked very well every day, maintaining a good atmosphere as a team. We won this title because we played as a team and worked as a team, everyone. Not only the players. Everyone at the club who was involved this season wanted to win this title and, in the end, everyone did a fantastic job.
"It's a fantastic moment. I remember every victory because every one stays in your mind. I'm happy to have done this in my first season. I had a lot of help because I found a team and a club with fantastic organisation. So it was easy for me to do my best.
"We had fantastic opponents and Manchester United stayed with us right to the end. I said it would go to the last game, so we have to be proud and happy that we won against such a fantastic team like United. They were a very good opponent."
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