Final answer:
Jefferson's efforts using the Embargo Act of 1807 to apply economic pressure on Britain and France were not successful and instead damaged the U.S. economy.
Step-by-step explanation:
The statement that Jefferson's efforts to use economic pressure to solve the situation with Britain and France were successful is false. President Thomas Jefferson's approach was known as the Embargo Act of 1807, which prohibited American ships from trading in foreign ports in an attempt to avoid conflict and to coerce Britain and France to respect American neutrality during their ongoing war.
However, this policy ended up harming the U.S. economy significantly without achieving its intended diplomatic goals, leading to widespread criticism and negative economic impacts.