US technological leadership and domination of the world economy were further enhanced by the extraordinarily rapid rate of technical change and output growth in the semiconductor, computer, and telecommunications industries in which American firms played a leading role and to which American universities made a vital contribution. Whereas some historians have cast doubts on the pervasiveness and the magnitude of the effects of earlier technological revolutions, such as the railways, few doubt the significance of the Information Technology Revolution and some, such as Castells, see it as ushering in a new type of economy and even a new civilization. Just as in the 1920s the Hoover Report had stressed that changes in mass production technology...