It was the refinement of the Bessemer process, first used in the United States in the 1860s, that allowed for the major advance in skyscraper construction. As steel is stronger and lighter in weight than iron, the use of a steel frame made possible the construction of truly tall buildings.
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The Western Front was a military theatre of World War II
Slovakia became an independent nation in 1993 when it split with "<span>c. the Czech Republic". It should be noted that this shift occurred during a period of great ethnic turmoil in the region. </span>
