America secretly resents Canada.
Even if no one remembers Canada, they remember America. They remember how annoying and boisterous he is, and then when the do remember Canada, they compare America to him.
“Why aren’t you quieter like Canada?”
“Why don’t you be nice, Like Canada?”
“Why aren’t you like Canada?”
He secretly likes that no one remembers Canada… and he hates himself for wanting such a horrible thing for his little brother…