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| 1930 |
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| The French in the Congo spent 3 million francs to combat sleeping sickness. | 1 |
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| 1930–33 |
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| Great suffering in Angola from the depression, aggravated by drought and locusts. | 2 |
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| 1933 |
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| It was estimated that there were more than 1 million Catholics in the Belgian Congo. | 3 |
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| 1935 |
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| The Salvation Army began work in the Belgian Congo. | 4 |
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| 1939 |
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| One hundred thousand students were attending school in Cameroon. | 5 |
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| 1940 |
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| Mvungi cult emerged on the River Congo. Tonsi movement began in western Angola. | 6 |
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| Aug. 27 |
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| The Free French took control of Cameroon. Brazzaville was taken the next day. | 7 |
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