Frontiers Became Borders
A frontier is a zone. A border is a line. Almost every political space in history was the first thing, and the modern world is built on the assumption it was always the second.
Pre-modern authority faded with distance. Power was strong at the centre, weaker further out, and somewhere in the mountains it became a matter of negotiation, tribute, and periodic reminder. Two empires could both plausibly claim the same valley, and the valley could pay both, or neither, depending on the year. There was no line because a line answers a question — exactly where does one sovereignty stop? — that nobody needed answered.
The line arrives with the state that needs to tax, conscript, and administer uniformly. Then it arrives everywhere, fast, and the world is partitioned:
| Type | Definition | Trouble |
|---|---|---|
| Antecedent | Drawn before dense settlement | Often the calmest |
| Subsequent | Evolved with settlement, following existing divisions | Fits the people; fits the terrain poorly |
| Superimposed | Imposed over an existing cultural landscape | Cuts through nations — the colonial signature |
| Relict | Abandoned, but still visible | Shows up in voting maps for centuries |
Relict boundaries are the eeriest thing in this field. The border between Prussian and Russian Poland disappeared in 1918. It is still visible in Polish electoral maps, in road density, in rail gauge legacies — a line that has not existed for over a century still organizing behaviour, because a border builds institutions and institutions outlive the border by generations.
The Straight Line Problem
Look at a map of Africa and the straight lines are unmistakable. About 30% of African land borders are straight lines drawn on projections by people who had not been there, and they partition ethnic groups roughly 40% of the time.
But the honest version is more interesting than "colonial borders caused Africa's conflicts":
- The lines are real damage, and they were drawn at conferences by men naming rivers they could not have found.
- Yet post-independence African states almost universally kept them — the OAU adopted the inherited borders as a founding principle, on the entirely sane grounds that opening the question would be worse than the answer.
- And partitioned groups are not reliably more conflict-prone than unpartitioned ones. The effect is real, contingent, and much smaller than the rhetorical use made of it.
The general lesson: a line drawn in ignorance becomes real by being administered. Two sides of an arbitrary border accumulate different currencies, schools, languages of administration, legal systems, and road networks — and after sixty years the arbitrary line is describing a genuine difference it created. The map preceded the reality, and then produced it.
Geopolitics: A Warning
Mackinder's Heartland thesis (1904) — that whoever controls the Eurasian interior controls the world — is the founding text of geopolitics, and it is a superb illustration of the genre's problem. It was elegant, influential, and read as a law of nature. German Geopolitik took it up and welded it to Lebensraum, and the result was an academic theory functioning as a justification for conquest.
The trouble with geopolitical laws is that they present a strategic argument as geography. Distance and terrain are real constraints; "he who controls X controls the world" is a policy dressed as a fact — and a theory that tells a state what it must do, in the language of inevitability, is a theory doing political work while claiming to be a map.