Sentence:  The Negroes have been so industrious for the last decade that they have <WSD>overflooded</WSD> the cotton markets of the world, and consequently so reduced the price of this staple that the landlords are not disposed to feed hirelings through the winter, and the colored people, who have been fed from the stores under the mortgage system, getting all their food on time at two prices, and paying for the same in cotton in the fall at half price, find themselves in the end in debt and greatly discouraged. 
Meaning of the word marked with <WSD> tags:  To flood or fill completely; to overflow.