1. Wolves were basically exterminated in the continental US for most of the 20th century
2. There were still deaths from wolf attacks in North America during that time
What are you talking about? There's tons of wolves in my county. They aren't 'basically exterminated' at all. And there's zero human attacks. Lots and lots of cow attacks though.
Yellowstone park rangers killed the last wolves there in 1926, and by the middle of the 20th century, the total population in the Lower 48 had been reduced to a few hundred in Minnesota and Michigan.