almost never happens apparently.
"Below these quotas, American dairy sales to Canada face zero tariffs. The United States–Mexico–Canada Agreement, or USMCA, a trade agreement negotiated by the first Trump administration, had raised the thresholds for the protectionist tariffs."
https://www.factcheck.org/2025/04/trumps-misleading-claim-on-canadian-dairy-tariffs/Edited by noodle at 14:51:52 on 04/07/25