Answer:
D. Europe
Explanation:
After the Napoleonic wars, the monarchy was re-established in Europe which threatened ex-European colonies in the Americas with being conquered back by the European powers. Since this European intention of involvement in the Americas was against the interests of the United States of becoming the only power present in the Americas, President Monroe backed a foreign policy contrary to European colonialism in the continent. This policy was known as the Monroe doctrine. The doctrine was presented by President Monroe during his sixth speech to Congress on the State of the Union. It was taken with doubts, at first, and then with enthusiasm. It was a decisive moment in the foreign policy of the United States. The doctrine was conceived by its authors, especially John Quincy Adams, as a proclamation by the United States of its opposition to colonialism. It established that any intervention by Europeans in the Americas would be seen as an act of aggression that would require intervention by the United States of America.
