in what ways was the monroe doctrine a departure from previous u.s foreign policy?

Answer 1

President James Monroe first stated the doctrine during his seventh annual State of the Union Address to Congress, a defining moment in the foreign policy of the United States.

The doctrine's authors, especially John Quincy Adams, saw it as a proclamation by the United States of moral opposition to colonialism, but it has subsequently been re-interpreted in a wide variety of ways, including by President Theodore Roosevelt as a license for the U.S. to practice its own form of colonialism, the Roosevelt Corollary to the Monroe Doctrine.

Although it would take decades to coalesce into a notably identifiable policy, John Quincy Adams did raise a standard of an independent U.S. foreign policy so strongly that future administrations could not ignore it. One should note, however, that the policy succeeded because it met British interests as well as those of the United States.

Answer 2

it called for the united states to adopt a policy of non-inolvement in foregin affairs.