Final answer:
John Quincy Adams influenced U.S. foreign policy as Secretary of State by promoting continental expansion, foreign trade, and defending the Monroe Doctrine, which warned European powers against colonization in the Western Hemisphere.
Step-by-step explanation:
John Quincy Adams' Influence on U.S. Foreign Policy
As the Secretary of State under President James Monroe, John Quincy Adams played a pivotal role in shaping U.S. foreign policy during a time that became known as Diplomatic Nationalism. Adams promoted continental expansion, strived to promote foreign trade, and sought to diminish European influence in Latin America. He spoke out in defense of the Monroe Doctrine, which he helped draft.
The Doctrine warned European powers against further colonization and interference within the Western Hemisphere, thereby establishing a principle that would guide American foreign policy for years to come. Adams believed in the unique virtue of the United States and its 'God-given right to expand', affecting the nation's trajectory towards becoming a global power.