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Reference.com/Encyclopedia/2nd century BC (695 words) |
 | The end of the century witnesses the reforming of the Roman Army from a citizen army to a voluntary professional force, under the guidance of the great general and statesman Gaius Marius - (Marian Reforms). |
| Also in the 2nd century BCE, the Han defeats the Mongol-Turkic tribes of the steppes, driving the Xiong Nu/(Huns) west. |
| Perhaps the original or a Roman copy of the 1st century AD is discovered in 1506. |
| 20th century - encyclopedia article about 20th century. (3346 words) |
| 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. |
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