Without any formal argument how can any of this be true? Simply stating that an entire country is better than another without any evidence of why is just obnoxious and only promotes fighting.
For there to be an accurate number you would need the total population that plays from each country, factor in the number you wish to look at in terms of "skill", more than not it would have to be W/L, because K/D really doesn't measure anything unless were talking strictly slayer, and then run statistics on all of this information while controlling for other confounds.
You would also need to figure who Canadians, Americans, or English face every single match. If they are facing someone from their own country, how can you measure that another country is better when you are beating your own countrymen?
Example today, I absolutely stomped two polish guys in Oddball today, what did they say after the match? "oh connection let you win" as well as comments "343 is American so they only care about those connections" ._.
TL;DR, if you say your country is better, I would love to see why you think so.
"Tryhards is a slang word for men with erectile disfunction, which is an actual disease that people don't 'choose' to have." -cayerful1