Well, as much as you all would like to castigate we Canadians for foisting the "metric crap" on to you, we are pretty much still at the same level in regards to metric/"imperial" measurement as you in the USA!.... The Free Trade Agreements have pretty much seen to it that the standards of your country and our country remain "harmonized".... I own a pretty good selection of tools in both "languages".... and my Chevy truck has the same metric/imperial distribution of fasteners as any of yours in the USA have....
The real "problem" is that the manufacturers want to sell their products in "metric only" countries and they have begun harmonizing their dimensioning with that in mind.... So.... if you want to use a line from a jingo from the show Southpark.... you can go ahead and "Blame Canada"....