The sentence that states the author's thesis is "The President of the United States moved into the camp originally intended for the families of federal workers."
<h3>What is Presidential Retreat?</h3>
The presidential retreat was given by Franklin D. Roosevelt. It was for the hot weather of Washington, D.C. He started a camp and then renamed it "Shangri-La"
Thus, the correct sentence is the last second sentence that is The camp for federal employees' families became the camp of one federal employee, the President of the United States.
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