All of the following events contributed to the exodus of blacks from the South to the North during the First World War EXCEPT

A) boll weevil infestations which devastated the cotton crops.
B) the abrupt halt of immigration from Europe.
C) the flooding of the Mississippi River's Gulf Region.
D) the development of the Dust Bowl on the Great Plains.

Boll Weevil

A beetle that feeds on cotton buds and flowers, historically causing massive damage to the cotton industry.

Immigration

The action of coming to live permanently in a foreign country, often for work, family reunion, or as a refuge from conflict or persecution.

Dust Bowl

A period of severe dust storms during the 1930s, causing significant ecological and agricultural damage to American and Canadian prairies.