Explain how debt slavery made rubber merchants rich.

Debt slavery, also called debt servitude, debt bondage, or debt peonage, a state of indebtedness to landowners or merchant employers that limits the autonomy of producers and provides the owners of capital with cheap labour. Examples of debt slavery, indentured servitude, peonage, and other forms of forced labour exist around the world and throughout history, but the boundaries between them can be difficult to define (see slavery). It is instructive to consider one prevalent system of debt slavery as a means of identifying the characteristics typical of the condition. This article therefore describes the system that existed among sharecroppers and landowners in the American South from the 1860s until World War II.

Explanation:

the answer is the government.