Final answer:
Jefferson's solution to the harassment of U.S. ships by European powers was to cut off trade with all of them through the Embargo Act of 1807, making the given statement true.
Step-by-step explanation:
The statement is True.
Jefferson's solution to the harassment of U.S. ships by European powers was indeed to cut off trade with all of them. In 1807, he proposed the Embargo Act, which aimed to restrict American ships from leaving their ports until Britain and France stopped seizing them on the high seas. The act had a negative economic impact on both countries, but it also devastated American commerce, causing economic hardship at home.
Despite the hopes for the act to put an end to the harassment of American shipping, it ultimately failed to achieve its intended purpose, and both Britain and France continued to ignore American neutrality.