As Secretary of State, John Quincy Adams A. negotiated a treaty with Great Britain for Oregon Country.
B .made Manifest Destiny an official United States policy.
C. convinced Great Britain that it could not control Florida.
D. negotiated a treaty with Spain for control of Florida.

D. Negotiated a treaty with Spain for control of Florida.

Explanation:

In 1019 Adams had a brilliant diplomacy with Spain, which led to the Adams-Onís Treaty of 1819, was largely responsible for the Acquisition of Florida and the U.S. assumption of Spain's claim to the Oregon Country.

he believed that strong monarchies would lead to social and political stability.

roosevelt believed that in light of the country's recent military successes, it was unnecessary to use force to achieve foreign policy goals, so long as the military could threaten force. this belief, and his strategy of “speaking softly and carrying a big stick,” shaped much of roosevelt's foreign policy.