Although Jefferson generally supported a limitation on federal power, in what area was he particularly aggressive?

Question

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Jefferson was particularly aggressive in the acquisition of additional territory for the U.S., most notably with the Louisiana Purchase in 1803, which doubled the size of the United States. This action contradicted his usual stance on strict interpretation of the Constitution, as the Constitution did not explicitly grant the federal government the power to acquire new territory.

Although Jefferson Generally Supported a Limitation on Federal Power, in What