How does the Monroe Doctrine extend or continue the American foreign policy of neutrality and / or isolationism?

In one paragraph

During his annual address to Congress, President James Monroe proclaims a new U. S. foreign policy initiative that becomes known as the "Monroe Doctrine." Primarily the work of Secretary of State John Quincy Adams, the Monroe Doctrine forbade European interference in the American hemisphere but also asserted U. S. neutrality in regard to future European conflicts.