I have to admit I am ignorant here, but always thought they and CASA were brought in later, but in the late 60's, Airbus was a Franco-German show against the yanks commercial aviation industry.
I beleive by content the largest supplier to the A380 is the USA, so all this nationalism is kind of a sideshow in the age of globalization.
For engine buffs the version of the CFM for the 707 was the never-produced CFM56-1. Later it was enlarged and became the very successful CFM56-2 for the KC135/E6 et al.