Seattle Sounders FC became the first team in the history of the confederation to win the title after beating Pumas UNAM 2-0 in the second leg and 5-2 on aggregate.
The first Major League Soccer side to win the annual club competition in its new format was the Sounders. There were only two other American teams that won a club title in the area before that.
A record CCL crowd of over 67,000 turned out for the second leg of the match at Lumen Field, following last Wednesday's thrilling first leg that ended in a 2-2 draw thanks to a pair of late penalties awarded to Seattle.
Live games and replays are available on the MLS website.
With half-time approaching, coach Brian Schmetzer's side found its opener when a laid off pass in the center of the penalty area found Ruidiaz, whose first-time shot took a deflection off a Pumas defender and bounced into the back of the net to give
Kelyn Rowe came on for Nouhou Tolo in the 11th minute and Obed Vargas came on for Joao Paulo at the half-hour mark.
With the game still within reach for Pumas late in the match, Ruidiaz scored his second on the tail end of a swift counter-attack by Seattle, curling a near-post strike from a Nicolas Lodeiro assist past Alfredo Talavera to double the lead.
The sell-out crowd went nuts when Lodeiro pounced on the rebound of a Jordan Morris shot that came back off the post and scored to put the game out of reach.
Juan Dinenno, the top scorer in the tournament, was quiet in the second leg. His best chance was a free kick. Frei made a great save on Diogo's free head in the 65th minute.
The title earned Seattle a spot in the next Club World Cup and added to an already filled trophy case that includes U.S. Open Cup titles, a MLS Supporters' Shield and two MLS Cup titles.
Real Salt Lake, Montreal, Toronto, and LAFC all fell short in the past as MLS teams that reached the final. Real Salt Lake and Montreal were defeated in the second legs of their games after drawing on the road.
It was a great tournament for Seattle, which went perfect in the knockout stage and went 2-0-2 against LigaMX clubs after beating Leon in the quarterfinals.
Since winning the Clausura crown, Pumas has not had a major title.
Information from the Associated Press was used.