There it is, it's a conspiracy!
Ask yourself this: If there was so much interest in the Canadian story among American audiences, don't you think it would be getting more time on the news here? If you're an editor and you think a story "has legs" to bring you more audience share for days, weeks, months, wouldn't you cover that story? Of course you would.
American news is still operating within the confines of capitalism. They cover what brings in an audience. But if you prefer to live in an alternative-facts world where news organizations collude with each other to keep your favored topics off the screen or page, fine.