The excerpt you've provided from President James Monroe's Seventh Annual Message to Congress highlights the principles of what would later be known as the Monroe Doctrine. This doctrine asserted that the Western Hemisphere was to be free from future European colonization and interference, emphasizing that the United States would not involve itself in European wars and conflicts.
Based on the context of the passage and the Monroe Doctrine's objectives, the correct answer would be:
increased US involvement in the affairs of Latin America.
The Monroe Doctrine essentially set the stage for the United States to justify its actions in Latin America, asserting influence and involvement in the region while discouraging European powers from colonizing or interfering in the Americas.