The flow of immigrants from the US to Canada is about 1/10th of vice versa, per capita. In order words, roughly the same numerical amount of people migrate in both directions, but the US is 10X as large. Having lived in both countries, there isn’t much in Canada to attract an American other than a spouse. There’s nothing wrong with Canada, it’s just that everything in Canada is available in the US as well. “Free” health care? Yeah no. The waiting lists here in Canada would shock and appall most Americans. I got far better care in the US than here in Canada, but I sure wouldn’t want to get caught without insurance in the US (most people have excellent insurance).