The complexity that characterizes most trade disputes between Canada and the United States is now being seen at the provincial and state level. On Feb. 20, Ontario's government tabled the Fairness in Procurement Act, which would empower the province to "take responsive and proportional action to discriminatory" measures enacted by American states. Ontario's proposed law arrives ahead of New York's Buy American Act taking effect on April 1. The New York law will require state entities to use American iron and steel in highway and other infrastructure projects....