Original: In 1902 the parts of the colony not organized into military districts became Senegambia and Niger, then Upper Senegal and Niger in 1904, then the old name came back in a reorganization of 1920.
Simplified: In 1902 the parts of the colony which were not organised into military districts became Senegambia and Niger, then the name changed to Upper Senegal and Niger in 1904.