Final answer:
The Louisiana Purchase revealed that Jefferson didn't strictly follow his own principles of strict constructionist interpretation of the Constitution.
Step-by-step explanation:
One act that revealed Jefferson didn't strictly follow his own principles was the Louisiana Purchase. Jefferson, who believed in a strict construction reading of the Constitution, initially had reservations about the constitutional authority to acquire new territory.
However, he put aside his strict constructionist views and made the purchase because he believed it was in the best interest of the United States. This decision expanded the powers of the federal government and went against his belief in limited government intervention.