Digging a little deeper it appears like McDonalds may have actually invented the sauce to appeal to the Dutch market, where fritessaus is popular (instead of tomato ketchup). Because McDonalds is American, their take on fritessaus grew into it's own thing called "American Fritessaus," or simply "American Saus."
http://www.typicaldutchstuff.com/ahamericanfritessaus-pi-364...
https://cf.geekdo-images.com/camo/271763ae14b82c0f612b6b9f61...
This is what I'm referring to.
Digging a little deeper it appears like McDonalds may have actually invented the sauce to appeal to the Dutch market, where fritessaus is popular (instead of tomato ketchup). Because McDonalds is American, their take on fritessaus grew into it's own thing called "American Fritessaus," or simply "American Saus."