Led by world champion Romain Febvre the French team, also made up of Gautier Paulin and Marvin Musquin, topped the podium by just two points on the legendary track at Ernee.
Justin Barcia started things off perfectly for Team USA by winning Race 1 but Febvre continued his fantastic 2015 MXGP rookie season, taking victory in both Race 2 and Race 3.
Belgium rounded off the podium but were well behind the top two after their epic battle for first place.
But despite Barcia, Jeremy Martin and Cooper Webb’s best efforts they fell just short thanks to the unstoppable Febvre.
“This is a dream come true,” said Febvre. “It’s been an amazing season for me. I did my job and they did theirs and we’ve won again so we will enjoy it for sure.”
The USA finished third last year in Latvia, at the expense of Great Britain, and were amoung the favourites again in 2015 despite the absence of Ryan Dungy and Ryan Villopoto from the team.
And they took an early points lead thanks to Barcia beating Musquin in the opening Moto after the Frenchman crashed on one of the final jumps.
“I got too excited," he said. "The crowd was going crazy and I made too many mistakes and finally I went down.”
He managed to salvage the situation however, recovering to finish fourth, although Febvre made no mistake when he took the track.
Webb ran him close in Race 2, finishing second to keep the USA in a narrow lead, but Febvre's second win in a row, ahead of Barcia in third place, was enough to seal an historic French victory.
Estonia and Switzerland rounded off the top five but Great Britain, who narrowly finished fourth last year, didn’t make the top ten after a Max Anstie suffered a massive crash in qualifying.