" As world prices fell during the Great Depression, the poll tax imposed on Africans remained the same in money terms, which is to say, it increased in real terms. To ensure the payment of this tax, the colonial official pressured African farmers into growing larger export crops, even at the expense of food. Thus Africans had to depend on government famine relief when local food crops were disappointing. "

― Thomas Sowell , Conquests and Cultures: An International History