Which of the following warned European powers not to interfere in the affairs of the Western Hemisphere?

The Truman Doctrine, announced in 1947, primarily aimed to contain the spread of communism during the Cold War by providing political, military, and economic assistance to countries resisting Soviet influence. While it emphasized American involvement in global affairs, it did not specifically address European interference in the Western Hemisphere.

The Wade-Davis Bill, proposed in 1864 during the American Civil War, sought to establish reconstruction policies for the Southern states. It focused on the terms of re-admittance of these states into the Union and did not concern itself with European powers or their involvement in the Western Hemisphere.

The Tonkin Gulf Resolution, passed in 1964, was a congressional measure that allowed the U.S. to engage militarily in Vietnam following alleged attacks on American ships. This resolution addressed issues in Southeast Asia and did not pertain to European relations or the affairs of the Western Hemisphere.