<span> In the last quarter of the 19th century, all four items were sources of energy. Kerosene was commonly used for lighting, electricity was beginning to replace gas lighting and steam was used to power boats, trains, and certain kinds of industrial machinery. Gasoline was the primary fuel of the automobile, or "horseless carriage," which appeared in the 1890's. Of these four, however, steam was introduce the earliest. The concept of the steam engine goes back to ancient times. However, the steam engine was really introduced as a common source of energy early in the 18th Century. So while kerosene, gasoline, and electricity as an energy source were all developments of the 19th century, Steam power is at least a century (and maybe more) older. </span>
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Feudalism helps the reducing of a level of inequality in many European nations because it generates a tradition of state paternalism, which set the time for the modern welfare state. Feudalism rises the perfect monarchies. Feudalism helped to stabilize European society.
The Monroe Doctrine had a long lasting impact on the foreign policy of the United States. Presidents throughout history invoked the Monroe Doctrine when intervening in foreign affairs in the Western Hemisphere. Here are some examples of the Monroe Doctrine in action.
1865 - The U.S. government helped to overthrow Mexican Emperor Maximilian I who was put in power by the French. He was replaced by President Benito Juarez.
1904 - President Theodore Roosevelt added the "Roosevelt Corollary" to the Monroe Doctrine. He used the doctrine to stop what he called "wrongdoing" in several countries. It was the beginning of the U.S. acting as an international police force in the Americas.
1962 - President John F. Kennedy invoked the Monroe Doctrine during the Cuban Missile Crisis. The U.S. placed a naval quarantine around Cuba to prevent the Soviet Union from installing ballistic missiles on the island.
1982 - President Reagan invoked the Monroe Doctrine to fight communism in the Americas including countries such as Nicaragua and El Salvador.
