Growth in the private sector has complicated life and compounded frictions. in the last 20 years the gross national product has tripled. Scientific and technological changes have brought a new sophistication to old disputes. In 1946. atomic energy. television and electronics were in their infancy. The communications and transportation industries were on a threshold no one fully appreciated. Space exploration was only dreamed of. Those who wrote the original law in 1946 hardly anticipated demographic developments this generation of Americans has witnessed. Better fuel. food. clothing. shelter. and medicine have prolonged the lifeexpectancy. and with the help of greater immigration. Americas population has increased by 45 million. Population is not only greater but it has become increasingly concentrated in urban pockets.
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immigration