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Every political right held by black Africans was restricted to their designated homeland, including their right to vote. The South African government established this law in hopes of black Africans becoming citizens of their designated homelands, thereby forfeiting their citizenship to South Africa.
The reason that led to the rise of the domestic slave trade was the regional specialization in labor production. The South had a much higher demand of slaves for the labor-intensive cotton plantations. This demand for labor pushed up the prices of the slaves, intensifying the trade.