Which of the following is not a reason slavery began in South Carolina?

A. South Carolina had key ports in the slave trade for the British colonies
B. The South Carolina colony required a significant amount of labour to maintain
C. Early Spanish settlements in South Carolina included the use of African slaves after Indian slaves died out
D. White indentured servants were taxed by the assembly

D. White indentured servants were taxed by the assembly

The correct answer is D. White indentured servants were taxed by the assembly.

To determine which of the given options is not a reason for the beginning of slavery in South Carolina, we can analyze each option and eliminate the one that does not fit.

A. South Carolina had key ports in the slave trade for the British colonies: South Carolina's strategic location made it a significant player in the transatlantic slave trade. Slavery was directly tied to the ports and the trade, so this can be considered a reason.

B. The South Carolina colony required a significant amount of labor to maintain: Maintaining a colony required labor, and using enslaved Africans was a common practice for meeting this demand. Therefore, this can be considered a reason.

C. Early Spanish settlements in South Carolina included the use of African slaves after Indian slaves died out: This suggests that African slave labor was used as a replacement for Indian slave labor. Hence, this can be considered a reason as well.

D. White indentured servants were taxed by the assembly: This option refers to white indentured servants being taxed. Although this might have been a factor influencing the use of indentured servants versus enslaved Africans, it is not directly related to the beginning of slavery in South Carolina. Therefore, this option is likely the correct answer and does not serve as a reason for the beginning of slavery.

In conclusion, option D -- white indentured servants being taxed by the assembly -- is the answer because it does not provide a reason for the beginning of slavery in South Carolina.