The response of the United States to the treatment of Jews by Nazi regime was shocking because the treatment, the deaths, the conditions, and the skeleton-like people. The US also was horrify what they saw what the Nazi did to the poor Jews.
The Louisiana Purchase occurred in 1803. At this time, the president of the United States was Thomas Jefferson, who approved the purchase despite domestic disapproval.
So in short, your answer would be president Thomas Jefferson.
I hope this answer has helped, and I apologize if this answer somehow finds itself to be incorrect.
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