It was the first time a team had scored 13 goals in a World Cup game — men’s or women’s — and the margin of victory was the largest for a match in either tournament. Morgan’s five goals equaled a record for a Women’s World Cup game set by Michelle Akers of the United States in 1991.

After securing a hat trick, which made the score 8-0, Morgan turned around and walked toward the center circle. After her fourth goal, she held out her fist and emphatically unraveled her fingers — one, two, three, four — before being mobbed by her teammates. After her fifth, she ran all the way to the sideline and took her place in a hastily choreographed group dance.

Morgan, who said she felt now that she was in “peak form,” was asked how she balanced the visceral impulse to celebrate with any desire to maintain a level of sportsmanship.

“In the moment, every time we score a goal in the World Cup — I’ve dreamed of it since I was a little girl,” Morgan said. “When it comes to celebrations, I think this was a really good team performance tonight, and I think it was important for us to celebrate with each other.”

For Jill Ellis, the United States coach, the desire to create confidence among her players seemed to be the main objective in a match that pitted the world’s No. 1 team against No. 34 and, as such, was never expected to be close.

In the 57th minute, for instance, after a run of four goals in six minutes, Ellis used her first two substitutions to insert two forwards, Lloyd and Christen Press, who could reasonably be called two of the best attacking players in the world despite their roles as reserves for the United States.

Twelve minutes later, Ellis pulled out Julie Ertz — who had been moved to central defense in place of Becky Sauerbrunn, who was held out of the match with a minor quadriceps injury — and sent out Pugh, yet another forward.