In contrast to mechanical waves, electromagnetic waves can travel without a medium. This implies that electromagnetic waves can pass not only through solid objects like air and rock but also through empty space.
James Clerk Maxwell, a Scottish scientist, created a scientific theory to explain electromagnetic waves in the 1860s and 1870s. He realized that electromagnetic waves can be created when magnetic and electrical fields combine together. He compiled this electricity-magnetism relationship into what are now known as "Maxwell's Equations."
German physicist Heinrich Hertz used Maxwell's theories to explain how radio waves are transmitted and received. In honour of Heinrich Hertz, the hertz, or one cycle per second, is the unit of radio wave frequency. Two issues were resolved by his radio wave experiment. First, he had proven that the speed of radio waves was the same as the speed of light, which was something Maxwell had only theorized.
This demonstrated how radio waves are a type of light. Second, Hertz discovered how to create electromagnetic waves by causing the electric and magnetic fields to separate from wires.
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Northerners in America, due to the new rulings of Henry Clay's Compromise of 1850, were required by law to abide strictly by the Fugitive Slave Law and report any runaway slaves they encountered to the proper authorities. This was especially stressing to the many abolitionists in the region.
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The Law of April 6, 1830 was issued because of the Mier y Terán Report to counter concerns that Mexican Texas]], part of the border state of Coahuila y Tejas was in danger of being annexed by the United States. Immigration of United States citizens, some legal, most illegal, had begun to accelerate rapidly. The law specifically banned any additional American colonists from settling in Mexican Territory (which included both California and Texas, along with the areas that would become Arizona, parts of Colorado, Nevada, New Mexico, and Utah.) It also outlawed slavery in Texas.[1]
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As a member of the Republican Party, Roosevelt had served as president from 1901 to 1909, becoming increasingly progressive in the later years of his presidency. In the 1908 presidential election, Roosevelt helped ensure that he would be succeeded by Secretary of War Taft.
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