The clearly outlined the role that the u. s. would play in the western hemisphere.
a. washington’s farewell address
c. louisiana purchase
b. monroe doctrine
d. adams-onis treaty

The Monroe Doctrine clearly outlined the role that the U. S. would play in the Western hemisphere. The correct option in regards to all the options given in the question is option "b". The Monroe Doctrine was a foreign policy created by the United states of America in the year 1823 to continue dominating the American continent. The Doctrine stated that any attempt by the European powers to colonize or interfere with the North or South American states would be viewed as an act of aggression and the United States of America would reply befittingly.