The reported new cases per 100,000 in Ontario, Quebec, and Canada are shown in this graph:
The blue line in the above graph is Quebec, the brown line is Canada, and the barely visible grey line is Ontario.
There was a bit of a discernible rise in the number of cases/100K two weeks after Canada Day [July 1], but there was no rise and even a slight fall after Civic Holiday, the first Monday in August .
Those big gatherings were nothing compared to September: Labour Day, School re-openings, and university/college re-openings. It's understandable that health professionals and politicians are concerned.
Locally, despite some blips early on this month, London Ontario's new cases seem to have leveled off back down at 2-3 cases/day [roughly half a case/day/100K], far fewer than the nation-wide or province wide cases/day/100,000.
Meanwhile, the US results help explain why Canada is loathe to reopen the borders for casual and tourist traffic.
To steal a phrase from my older son, David Ricardo Palmer, the US marches to the beat of a different harpist.