They were only allowed to be cooks or valets if they wanted to be in the white group of men. There were 2 groups that were intentionally racially segregated.
Answer: I believe It would be C. The Louisiana Purchase.
Explanation: The Louisiana Purchase happend in the 1803 where Louisiana Purchase expands U.S. territory west of the Mississippi River.
I think that the best answer is the geographic location: many other countries (Sweden for example) have tried being neutral at different times but did not manage to: but the fact that the US has only two boundaries, and that both other countries also have a history of fighting from independence from a European power, makes it possible that unless US decideds to get involved in international politics, it can be "left alone".
Thomas more and Niccole Machiavelli
The Spanish set up the encomienda system in the Americas.
The answer to your question is B. Spain
hope this helps :)