Unresolved Border Disputes Face New Pressure

Recent social media provocations by the US President, including a map depicting the American flag over Canada, have moved beyond the realm of political theater. While initially dismissed as symbolic, these actions coincide with a sharp escalation in trade restrictions. Washington has imposed duties on billions of dollars of Canadian goods, and Ottawa has responded with reciprocal bans on alcohol, dairy, and federal contracts. The immediate economic damage is significant, but analysts warn that the deeper risk lies in the erosion of the informal diplomatic frameworks that have kept long-standing border questions from becoming crises.

According to GN geopolitics/border, the relationship between the two nations has relied on a form of institutional trust rather than final legal settlements for several key maritime and Arctic issues. This trust, which held firm through two world wars and the Cold War, is now being stress-tested by the current trade war. The situation highlights a shift from a cooperative posture to one where unresolved legal ambiguities may be exploited for political or strategic leverage.

Unsettled Maritime Boundaries

Contrary to popular belief, there are no active legal disputes over land territory between the two countries, a situation that has remained stable since the 1903 Alaska Boundary Arbitration. However, three significant maritime and Arctic questions remain unresolved. The first involves the Beaufort Sea boundary, where competing interpretations of an 1825 treaty create ambiguity over jurisdiction. Negotiations held in late 2024 have stalled, with no follow-up meetings scheduled, yet the lack of immediate crisis suggests the status quo was previously deemed sufficient.

The second issue concerns the legal classification of the Northwest Passage. Ottawa maintains that these waters are internal Canadian territory, while Washington argues they constitute an international strait open to all shipping. The third dispute centers on Machias Seal Island in the Bay of Fundy, a rocky outcrop where a Canadian lighthouse has operated since 1832, despite a persistent US claim. These issues have persisted for decades without triggering sustained strategic conflict, largely because both governments avoided using them as leverage.

Trust as Diplomatic Mechanism

The stability of these unresolved issues was maintained through explicit agreements that prioritized cooperation over legal victory. The 1988 Arctic Cooperation Agreement is a prime example, where Washington agreed to seek Canadian consent before sending icebreakers through contested waters. Crucially, neither side relinquished its underlying legal claims. Instead, they established a mutual understanding that the disagreement would not be used to harm the broader bilateral relationship. This informal treaty was the primary mechanism preventing these maritime questions from escalating.

Rob Huebert, a director at the University of Calgary’s Centre for Military Security and Strategic Studies, warns that current policies disrupt this foundational assumption of unity. He notes that neither government had prepared for a genuine territorial challenge, as it was previously considered implausible. The current trade war is testing whether the trust that replaced formal legal settlements still holds, with the risk that unresolved boundaries may now be viewed through a more adversarial strategic lens.

Forward Look on Stability

The coming months will determine if the informal frameworks of trust can withstand the pressure of the ongoing trade conflict. Observers should watch for any unilateral actions in the Arctic or Bay of Fundy that deviate from past cooperative norms. If the US or Canada begins to enforce its legal positions strictly in response to trade grievances, the long-standing pattern of managed ambiguity could collapse, potentially turning dormant maritime disputes into active geopolitical flashpoints.