Geopolitics: Leaders Change, Coastlines Don't

Most commentary on international affairs is about people: which leader decided what, who said something provocative, which government is unpredictable.

This is understandable — people are interesting and decisions are visible. It also has a poor forecasting record, because leaders change and the situations they inherit mostly do not.

A more durable approach starts with constraints. Where a country sits. What it can grow, mine, or manufacture. Who it borders and how defensible those borders are. What it must import to function, and what it can withhold from others.

None of this determines what a country will do — states make genuine choices, and some make catastrophic ones. But constraints explain the menu of realistic options, and the menu changes far more slowly than the person choosing from it.

Constraints that outlast governments

Some facts about a country persist across every change of leadership.

Access to the sea. A landlocked country trades on terms set partly by its neighbours. This shapes foreign policy permanently, in ways no election alters.

Defensible borders. Mountains and wide rivers make invasion expensive. Open plains do not, and countries on them have historically maintained larger armies and been more preoccupied with buffer territory — not because of national character, but because of terrain.

Resource position. Whether a country must import energy or can export it changes almost everything about its external relationships, and it is not a policy choice.

Demographics. A young, growing population and an old, shrinking one present entirely different problems and time horizons. These trends are visible decades in advance and very hard to reverse.

The useful discipline is to ask, of any development: would this look different under a different leader? If yes, it is politics and may reverse. If no, it is structural and will persist through the next several administrations regardless of who wins.

There is a real failure mode here worth naming: geographic determinism, the idea that terrain dictates outcomes. It doesn't. Countries with similar geography have taken very different paths, and institutions, choices, and accidents matter enormously. Constraints narrow the options; they do not select from them.

Chokepoints and the geography of dependence

Global trade looks like a diffuse web and is actually routed through a surprisingly small number of narrow passages: a handful of straits, a few canals, specific pipeline corridors, a modest number of undersea cable routes.

The same concentration exists in production. Certain advanced manufacturing — semiconductors most visibly — happens in very few places. Some processed materials come overwhelmingly from one or two countries, not because deposits are rare but because the refining capacity concentrated there.

This is the theory of constraints at global scale: the throughput of the world economy is governed by specific narrow points, and whoever can interrupt one holds influence far out of proportion to their size.

It also explains why economic tools have become central instruments of statecraft. Export controls on manufacturing equipment shape another country's capabilities years ahead, because a facility that cannot buy the machines cannot advance. Sanctions on financial infrastructure work the same way — access to a payments network is a chokepoint like any other.

The corresponding lesson for anyone dependent on such a point is uncomfortable: efficiency concentrated your supply, and concentration created the leverage. Unwinding it means accepting permanently higher costs, which is why it rarely happens until after a disruption.

Two ideas worth holding carefully

Trade and conflict. A long-standing view holds that deeply trading partners do not fight, because war would be too costly for both. There is something to this — interdependence genuinely raises the price of conflict.

But the record is mixed, and the mechanism cuts both ways. Dependence is also leverage. A country that supplies something essential can restrict it; a country that depends on an import is exposed to that restriction. So the same relationship simultaneously restrains conflict and arms the parties with non-military weapons. The honest conclusion is that trade changes the form competition takes more reliably than it eliminates competition.

The Thucydides trap. The observation that a rising power challenging an established one often ends in conflict — because the rising power wants recognition it has not been granted and the established one fears displacement. The pattern is real and the pressure is structural rather than personal. It is also frequently overstated: the historical cases resolved peacefully often enough to prove the outcome is not determined, and the framing can become self-fulfilling if both sides treat conflict as inevitable. See the Thucydides trap for the fuller treatment.

The unifying point across both is that structural pressure is not destiny. It describes which way the ground slopes. Countries can and do walk uphill — it simply requires deliberate, sustained effort against a default, and recognising the slope is the first requirement for doing so.