Final answer:
John Adams' greatest accomplishment as President was creating a navy.
Step-by-step explanation:
John Adams' greatest accomplishment as President was creating a navy. Adams recognized the importance of a strong naval force for protecting American interests abroad. In 1794, he signed the Naval Act into law, which authorized the construction of new warships and the establishment of the United States Navy. The creation of the navy laid the foundation for a strong maritime defense and contributed to the growth and security of the United States.
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