This site is a little more official.
If you look on the right hand side, where it shows the four teams, not the two flags next to CLG's name. One of them is, in fact, the US flag. The other is the Canadian flag.
Similarly, SK-Gaming's flag on the WCG site is JUST Germany's, but they also have a Swiss player on the team, and the above site shows this fact as well.
So would you say that SK-Gaming was representing ONLY Germany even though they won the European WCG qualifying tournament? Would you say that Another Story was representing only Singapore even though they won the ROC tournament which included teams from Vietnam, the Philippines and Malaysia as well?
Furthermore, Elementz, HotshotGG and Bigfatjiji are ALL from Canada. More of the players on CLG are from Canada than USA.
Your citation just got owned.