Where the Tariffs Land: A Province by Province and State by State Exposure Map

Consider two true statements about the same measure. The first is that the affected trade represents a modest share of national output and that the effect on national growth is within the range of ordinary forecast error. The second is that in a manufacturing town where one plant employs a substantial share of the working population, a reduction in that plant's order book propagates through the local housing market, the municipal tax base, the school enrolment and the retail sector within a year.

Both are true. Only the second describes anybody's experience. National aggregation is designed to remove exactly the variance that matters here, which is why an argument conducted in aggregates tends to be an argument between people who are not discussing the same thing.

Southern Ontario and Quebec hold the deepest manufacturing exposure. Automotive assembly and parts, aerospace structures and industrial machinery are the sectors, and their defining characteristic is that they are not exporting to the United States so much as participating in a shared production line. This exposure is concentrated in communities where a single facility anchors the local economy, and where the supplier network around that facility is itself made up of small firms with thin balance sheets and no capacity to absorb a prolonged margin squeeze.

Alberta and Saskatchewan hold energy, potash and grain exposure. The distinguishing feature here is infrastructure. The pipeline and rail network was built to move product south, and alternative routing is a capital project measured in years and in billions rather than a commercial decision. This is a sector that can be harmed but that cannot readily reroute, which makes its exposure among the least elastic on the map.

British Columbia holds softwood lumber and port throughput exposure. Softwood is a long running dispute with its own history, and it is a case in which the product travels reasonably well but freight cost to distant markets consumes most of the margin, so nominal alternatives are not economic alternatives. Port throughput exposure is different in kind, because logistics operators lose revenue on volume regardless of who owns the goods.

Atlantic Canada holds seafood exposure. It is smaller in dollar terms and more severe in character, because live and fresh product cannot wait at a border. A delay that a steel shipper treats as a financing cost is a total loss for a lobster exporter. Perishability removes both the inventory buffer and the option to slow down and wait for policy clarity.

The Great Lakes corridor across Michigan, Ohio and Indiana carries the mirror image of the Ontario exposure. This bears emphasis because it is routinely described as though the two were opposed. They are not opposed. They are the same production system, and a measure that raises the cost of a component crossing the border raises it for the plant on both ends.

Midwest agriculture carries retaliation exposure rather than tariff exposure. The distinction matters because the harm arrives through a different channel. A farmer facing a counter tariff does not pay more for inputs, he loses an order, and the volume displaced from one market must find another at a lower price or not at all. Retaliation is also politically targeted by design, which means the affected regions are chosen rather than incidental.

Gulf Coast refining in Texas and Louisiana carries technical exposure. A significant share of that capacity is engineered for heavy crude, and Canada is the principal external supplier of it. Substituting lighter grades is not a purchasing decision but an engineering one, and reconfiguration takes years and substantial capital. This dependency runs in both directions, which is precisely why it is the most stable element of the relationship and the most damaging to disturb.

Northern border states carry two quieter exposures. They import Canadian electricity, particularly during demand peaks when domestic reserve margins are thin. And their local economies depend on cross border traffic, so a slower border reduces retail, hospitality and logistics activity in communities that appear in no trade statistic at all.

Every entry on the map above resolves into one question, and the question has three parts.

Does the product travel? Perishable goods fail immediately, which is why seafood and fresh produce exposure behaves unlike anything else on the list.

Does the infrastructure point anywhere else? Heavy crude fails here. So, largely, does natural gas. Infrastructure built over decades toward a single destination cannot be redirected within the timeframe of a policy dispute, and the option value of an alternative route is only created by building it before it is needed.

Does an alternative buyer exist at a comparable price? Softwood lumber generally fails this test, because freight to Asia or Europe absorbs the margin. Some manufactured goods pass it, though qualification with a new customer is a process measured in quarters rather than in weeks, which means even a successful reroute leaves a gap.

Sectors that pass all three tests experience the dispute as a margin problem. Sectors that fail any one of them experience it as a volume problem, and volume problems become employment problems. The map of severe local damage is very close to the map of sectors that fail at least one test.

Trade adjustment programmes have a long record of being announced generously and delivered narrowly. Three design features distinguish the ones that work from the ones that do not.

Speed matters more than size, because a worker who waits nine months for a retraining place has usually already left the region or accepted lower paid work, and the programme then supports a transition that already happened. Portability matters, because a credential that is not recognised across the border, or even across a provincial or state line, does not restore mobility. And sector specificity matters, because the skills of a machinist in a parts plant and those of a fish processor are not interchangeable, and a generic programme addresses neither.

The blueprint proposed in the main analysis in this package includes a trilateral reskilling track for exactly this reason. Adjustment support is not a humanitarian addendum to trade policy. It is the mechanism that determines whether open borders retain political consent in the places that carry their costs.

The Canada United States trade dispute is nationally modest and locally severe, and both descriptions have to be held at once to reason about it accurately. The severity is predictable rather than random. It concentrates where products cannot travel, where infrastructure points in one direction only, and where no alternative buyer exists at a workable price.

Those conditions are known in advance. They can be mapped before a measure takes effect rather than after, which means the distribution of harm from a trade action is a choice rather than a surprise. Policy that treats it as a surprise is choosing not to look.