Did Reddit year-end recaps expose Russian interference in Alberta?

It also suggests that Reddit has been sitting on this data showing signs of foreign interference and just didn't care to do anything about it.

I'm guessing it would be America, which is less of a problem because statistically most Redditors are American, and the two countries are diplomatically and socially very close, so a large number of Americans visiting a sub about small Canadian towns is less surprising than large amounts of Russians.

It'd be like if /r/queenstown had Australia as its second-biggest country of origin. Aus and NZ are so closely related (not just geographically, but socioculturally) that you'd expect that to be true, especially given Australia's comparatively large overall population compared to other potential candidates (per capita, you might not be surprised if a country like Tonga or Fiji were even higher, but in absolute terms that would be very surprising).

I'd really like to know that too. US maybe?

AFAIK during the seeding stage trolls try and get engagement. The moment they get people to engage, the game shifts to amplification. That way the people amplified are not the trolls themselves but actual people from the US, allowing them to keep distance from the future misinformation.