A nation for little more than 225 years, the United States is a relatively new member of the global community, but its rapid growth since the 18th century is unparalleled. The early promise of the New World as a refuge and land of opportunity was realized dramatically in the 20th century with the emergence of the United States as a world power. With a total population exceeded only by those of China and India, the United States is also characterized by an extraordinary diversity in ethnic and racial ancestry. A steady stream of immigration, notably from the 1830s onward, formed a pool of foreign-born persons unmatched by any other nation; 60 million people immigrated to U.S. shores in the 18th and 19th centuries. Many were driven, seeking escape from political or economic hardship, while others were drawn, by a demand for workers, abundant natural resources, and expansive cheap land. Most arrived hoping to remake themselves in the New World.
Americans also have migrated internally with great vigour, exhibiting a restlessness that thrived in the open lands and on the frontier. Initially, migratory patterns ran east to west and from rural areas to cities, then, in the 20th century, from the South to the Northeast and Midwest. Since the 1950s, though, movement has been primarily from the cities to outlying suburbs, and from aging northern metropolises to the growing urban agglomerations of the South, Southwest, and West. At the dawn of the 21st century, the majority of the U.S. population had achieved a high level of material comfort, prosperity, and security.
Nonetheless, Americans struggled with the unexpected problems of relative affluence, as well as the persistence of residual poverty. Crime, drug abuse, affordable energy sources, urban sprawl, voter apathy, pollution, high divorce rates, AIDS, and excessive litigation remained continuing subjects of concern, as were inequities and inadequacies in education and managed health care. Among the public policies widely debated were abortion, gun ownership, welfare reforms, and the death penalty.
Many Americans perceive social tension as the product of their society’s failure to extend the traditional dream of equality of opportunity to all people. Ideally, social, political, economic, and religious freedom would assure the like treatment of everyone, so that all could achieve goals in accord with their individual talents, if only they worked hard enough. This strongly held belief has united Americans throughout the centuries. The fact that some groups have not achieved full equality troubles citizens and policy-makers alike. "USA" © Emmanuel BUCHOT, Encarta, Wikipedia
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