Oligarchy, government by the few, especially despotic power exercised by a small and privileged group for corrupt or selfish purposes. Aristotle used the term oligarchia to designate the rule of the few when it was exercised not by the best but by bad men unjustly.
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Industrial Revolution, in modern history, the process of change from an agrarian and handicraft economy to one dominated by industry and machine manufacturing. This process began in Britain in the 18th century and from there spread to other parts of the world. Although used earlier by French writers, the term Industrial Revolution was first popularized by the English economic historian Arnold Toynbee (1852–83) to describe Britain’s economic development from 1760 to 1840. Since Toynbee’s time the term has been more broadly applied.
Mainly from Europe more specifically Germany ,Ireland, England and France due to various problems such as crop failure. They have also immigrated because of Christopher Columbus's voyages of the new world.
D. The new political ideas began to replace democratic values