4. Canada's sky high tariffs on U.S. eggs, poultry, milk
Fast forward to today. Smoot-Hawley is long gone, but Canada continues to charge steep tariffs on U.S. imports of eggs, chicken and milk.
For instance, some tariffs on eggs are as high as 238% per dozen, according to Canada's Agriculture Department. Some milk imports, depending on the fat content, are as high as 292%.
"They're so onerous that you can't bring it across. There's no American eggs in Quebec," says Velk.
The U.S. does have tariffs on some goods coming from all countries, but they are not nearly as high as Canada's.
Experts say these tariffs continue to irk some U.S. dairy and poultry farmers, who essentially can't sell into the Canadian market. But they doubt much will change since the tariffs have been in place for decades now.