Wisconsin has a border with Canada?
I don't think you can generalize about drivers, no matter where. But if you ride on busy shoulderless roads with heavy truck traffic, you're likely to have occasional issues no matter where you are.
I did the Lake Erie Connector through Ontario last summer and had almost no problems. I followed the route, which takes you off the main roads as much as possible. Nevertheless, you will have the occasional big truck that needs to pass you, and some of those roads are so small that they cannot really give you much room. I did have one big truck that drove about 10 feet behind me for quite a while until it was safe to pass. It did kind of creep me out. 98% of the time, however, there was no traffic at all.
There's good and bad on every route.