Final answer:
The country being discussed is Congo Free State in George Williams' "Open Letter to His Serene Majesty Leopold II".
Step-by-step explanation:
The country being discussed in George Williams' "Open Letter to His Serene Majesty Leopold II" is Congo Free State. The letter was written in 1890 and was addressed to Leopold II of Belgium, who was the ruler of the Congo Free State at that time. In the letter, Williams criticizes Leopold II for the atrocities committed in the Congo Free State, including forced labor, violence, and exploitation of the Congolese people.
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