The purpose of the warren commission was to

The purpose of the Warren Commission was to investigate the assassination of President Kennedy.

Explanation:

The Warren Commission investigated the murder of President John F. Kennedy. The committee consisted of seven members, with Chief Justice Earl Warren as chairperson and one of the members being the later President Gerald Ford. In 1964 they wrote an 888-page report on the murder, plus 26 volumes of testimonials and annexes, in a total of 26,000 pages. The report was presented to President Johnson on September 24.

the monroe doctrine is the best known u.s. policy toward the western hemisphere. buried in a routine annual message delivered to congress by president james monroe in december 1823, the doctrine warns european nations that the united states would not tolerate further colonization or puppet monarchs.