Rostow himself noted that the University of Texas campus was ultra-modern as the Texas government had used its oil wealth to create a gleaming, modernistic campus, but complained that the university administration was more interested in supporting the football team, the Longhorns, than in research and teaching. From 1969 to 1971, Rostow served as one of the ghostwriters on Johnson's memoir, "The Vantage Point", writing all of the chapters dealing with foreign affairs. As the teaching load at the University of Texas was very light, Rostow had much time for research and between 1969 and 2003 wrote 21 books, mostly on world economic history with a particular focus on economic modernization. In his own memoir, "The Diffusion of Power", Rostow argued that for the justice of the Vietnam War and lashed out at Kennedy for ignoring his advice in 1962 to invade North Vietnam, writing that this "was the greatest single error of U.S foreign policy in the 1960s". Reflecting his friendship with Johnson, Rostow was less harsh towards him in his memoir, but still he charged that Johnson was too worried about the possibility of a nuclear war with China and should have taken his advice to invade North Vietnam, arguing that the risk of a nuclear war with China was acceptable. The main villain in "The Diffusion of Power" was McNamara, who Rostow accused of being a defeatist from 1966 onward, charging that it was his weakness and doubts about the war that caused Johnson to hold back and not invade North Vietnam.