They argued with each other, not locals
In 1494, Spain and Portugal drew a line along a meridian in the Atlantic and divided lands not yet discovered: everything west of it went to one crown, everything east to the other. That is why Brazil speaks Portuguese: its coast lay east of the line. The treaty was not about land, but about keeping the two crowns from going to war with each other.
Four centuries later, the logic had not changed. In fall 1884, representatives of fourteen states - European countries, as well as the United States and the Ottoman Empire - gathered in Berlin to discuss the Congo and rules for dividing Africa. No Africans were at the table. The conference itself did not draw up the map: it agreed on a procedure, and the pieces were divided later through bilateral agreements.
- 1494Spain and Portugal divide the not-yet-discovered world along a meridian
- 1884The Berlin Conference adopts rules for dividing Africa
- 1914Almost the entire continent is under European rule
- 1960sColonies become independent - with the same borders
How they proved land was theirs
The rule was called "effective occupation": for a coastal possession to be recognized, a power had to notify the others and show at least some presence - a post, a flag, a government representative. Further inland, paperwork was enough.
They obtained that paperwork through treaties with local rulers. The text was written in a European language, translated by employees of trading companies, and "cession of territory" meant very different things in European law and local systems of ownership. That did not bother rivals: a signature meant the territory was occupied.
If you break a claim down by weight - what decided the outcome and what was just a formality - this is what supported it.
- Neighboring power's recognition
- Signed local treaty
- Flag, post, a few soldiers
- Residents' views - not asked
That is where the straight lines came from. Borders followed meridians, parallels, and arcs because they were drawn in Europe, on maps with blank spaces, and negotiated not with residents but with one another. The lines cut across peoples, pastures, and trade routes however they happened to: they simply were not on that map.
Why no one redrew these lines
By 1914, only two countries on the continent had formally escaped partition - Ethiopia and Liberia. Half a century earlier, Europeans held about a tenth of Africa, mostly coastal outposts; the rest was divided among powers in roughly thirty years.
Africa under European control in 1914 - about 90%
Then, in 1964, the leaders of newly independent African states agreed in Cairo not to revise the borders. Not because they considered them fair: moving one line would open disputes over all the others at once. Keeping someone else's drawing turned out to be cheaper than dividing everything again.
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Sources
- General Act of the Berlin Conference of 1885, Treaty of Tordesillas of 1494, OAU resolution on the inviolability of borders, Cairo, 1964