The trends of mechanization of goods and services and networks of global communication, which were begun in the 19th century, continued at an ever-increasing pace in the 20th.
The 20th century has sometimes been called, both within and outside the United States, the American Century, though this is a controversial term.
Advances in fundamental physics through the theory of relativity and quantum mechanics led to the development of nuclear weapons (known informally as "the Bomb" and dropped on the industrial town of Hiroshima and the historic one of Nagasaki), the nuclear reactor, and the laser.
The unrestrained imagination of Arab chroniclers has indeed added to their annals a third or pre-historic tract, peopled with heroes and giants, men of renown, sons of Anak, much resembling those who figure in early Jewish records, and, it may be not unfairly presumed, of analogous authenticity.
To such belong the fabulous tribes of "ad in the south, of Thamood in the north, and of Tasm and Jadis in the centre of the peninsula.
Their sovereignty was at last overthrow, 5299 A.D., by an Abyssinian invasion, and was re-established 603A.D. as a dependency of the Persian empire, till in the year 634 it was finally absorbed by Mahometan conquest.
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