Kennedy's continuation of Presidents Harry S. Truman and Dwight D. Eisenhower's policies of giving economic and military aid to South Vietnam left the door open for President Johnson's escalation of the conflict. At the time of Kennedy's death, no final policy decision had been made as to Vietnam, leading historians, cabinet members, and writers to continue to disagree on whether the Vietnam conflict would have escalated to the point it did had he survived. His agreement to the NSAM 263 action of withdrawing 1,000 troops by the end of 1963, and his earlier 1963 speech at American University, suggest that he was ready to end the Vietnam War. The Vietnam War contributed greatly to a decade of national difficulties, amid violent disappointment on the political landscape.