The US team were able to watch their future opponents Wales claim a 33-12 win over Zimbabwe at the AT&T Park in San Francisco's Bay Area to set-up a meeting later in the day. About 30 minutes later they stood shoulder to shoulder again, this time atop a podium with gold medals draped around their necks.
Blyde clinched it with two quick late tries for her hat-trick to make it nine for the tournament, five years on from the Ferns' previous title victory in Russian Federation.
They're now set to play England in the final.
France tackled ferociously in an attempt to pin the New Zealand women back in their own half but soon found themselves another try down when captain Sarah Goss broke clear and swept forward in an attack capped by Portia Woodman's try in the corner. "After we won that, everybody was saying, 'These guys got a chance to win the World Cup.' People started really believing us and it shows that they showed up tonight to support us".
They would have expected to face neighbours Australia in the last eight but the sixth seeds suffered the surprise loss of the round.
The incident arose in the tunnel after Wales' 24-19 win in San Francisco. "When you have quality players like Justin Geduld, Werner Kok, Selvyn Davids and Rosko Specman feeding you try-scoring passes, it is my job to make sure I finish their good work", said the Eastern Cape-born winger. Broadcaster NBC introduced the sport to new audiences across the nation, which was a major driver behind record fan growth, while sevens' made for social media format is proving a hit with youth audiences in the USA. "I am very proud of their attitude".
Australia claimed the bronze medal with a hard fought 24-14 victory over hosts US on a day when a a noisy and enthusiastic crowd of over 33,000 packed in to the spectacular AT&T Park, home of the San Francsico Giants.
The 24-team men's field has been reduced to quarterfinalists while the 16-team women's tournament will be decided among New Zealand, Australia, the United States and France on Saturday.