Like today, timber, lumber and dairy were commodities of interest in trade negotiations in the nineteenth century.
The president has said the U.S. always loses in Canada-U.S. dispute resolution proceedings.
The Trump administration recently imposed an anti-dumping duty on Canadian softwood lumber exports.
President Trump called Canada’s system of supply management for dairy products a "disgrace."
Canada’s lumber companies deny that softwood lumber exports are subsidized by so-called stumpage fees.