You can throw in the Zulus and perhaps every other "indigenous" people. There's no doubt that they aren't as tough as they come.
My point is the idea that Americans, Canadians and just about any "people" aren't tough is nonsense. If you grow up in a fierce warrior society, there's a great chance you are going to be one too. Working class, minorities, the disadvantaged, tend to be tough. It's the one thing they can be better at. "Look at those tea-sipping girly men." The Quebecois, in turn, distinguished themselves among the Canadian soldiers. French Canadians were second class in Canada. That's why Maurice Richard became such a hero in Quebec. He retired in 1960. His picture was found next to the word "tenacious" in French Canadian school books in the 1970s-80s.
Jackie Chan started out as a stuntman, as I'm sure you know. The height of what a stuntman could do was to do an extremely dangerous and painful stunt, fail, get busted up, dust yourself off and do it again. That earned you the respect of your peers. Jackie left the film industry, because he didn't want to be a cripple by the age of 40 while having no money to show for. He was fortunate. He was called back and became a star. If people can chose, they generally chose being a "sissy" millionaire movie star to being a poor macho stuntman. For the same reason most people are not going to let a bunch of bullet ants sting them just to show how tough they are.