Or how about we just go off this map which can also be found on Wikimedia?
It was created in 1950 from the Belgium Royal Academy of Colonial Sciences' General Atlas of the Congo.
The same atlas by the way shows the more familiar borders of Katanga in 1912:
This is why. Trading concession borders were the nominal political structure at first:
So in summary, Katanga was taken over in 1891 but run by a different company than the one actually running Leopold's Congo Free State. A separate administration was set up in 1900 and remained in force until the entire CFS and Katanga were taken over directly by the Belgian government in 1910 after which Katanga was integrated into Belgian Congo but retained major autonomy (note in the 1912 map above how it is termed as "vice government-general of Katanga") until 1933.
It was created in 1950 from the Belgium Royal Academy of Colonial Sciences' General Atlas of the Congo.
The same atlas by the way shows the more familiar borders of Katanga in 1912:
I suspect the rectangular Katanaga border only existed as a trading company concession, and not as something that was part of the nominal political structure. The question then becomes, why is the Katana region being drawn with trading concession borders, while the rest with civil authority borders?
This is why. Trading concession borders were the nominal political structure at first:
Leopold took possession of Katanga and on 15 April 1891 its administration on behalf of the Congo Free State (CFS) was entrusted to another of Leopold's companies, the Compagnie du Katanga. No effective administration was set up until 19 June 1900, when it was renamed the Comité Spécial du Katanga, an administrative entity separate from the CFS. The Luba resisted, most notably in a major rebellion in 1895, after which many Luba were sent to work as forced labor in the copper mines of Katanga. Kasongo Nyembo [fr] led another rebellion of the Luba that was not suppressed by the Belgians until 1917.
After the take-over of the CFS from Leopold by the Belgian government, on 1 September 1910, Katanga was integrated into the Belgian Congo but retained a large measure of autonomy until 1 October 1933, when part of its Lomami Province was transferred to Kasaï Province.
On 1 October 1933, it was renamed the province of Élisabethville (in French; Elisabethstad in Dutch), after its capital (now Lubumbashi).
So in summary, Katanga was taken over in 1891 but run by a different company than the one actually running Leopold's Congo Free State. A separate administration was set up in 1900 and remained in force until the entire CFS and Katanga were taken over directly by the Belgian government in 1910 after which Katanga was integrated into Belgian Congo but retained major autonomy (note in the 1912 map above how it is termed as "vice government-general of Katanga") until 1933.
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