Final answer:
Jefferson's strategy of using economic pressure against Britain and France was not successful; it led to domestic economic hardship and was unpopular.
Step-by-step explanation:
The statement regarding Jefferson's efforts to use economic pressure to solve the situation with Britain and France being successful is false.
Jefferson's strategy, notably the Embargo Act of 1807, aimed to force Britain and France to respect American neutrality during the Napoleonic Wars by cutting off all American exports to these nations.
However, this act ended up damaging the American economy significantly more than it affected Britain or France, leading to widespread unpopularity and economic hardship within the United States.