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Historical signifcance of expositions

What historical reason was there for holding the Paris Exposition? What were some of the modern techniques that were used to create the symbol of the exposition â?" the Eiffel Tower? What kind of reaction did the tower receive from the Parisians? Why, if it was supposed to be a temporary structure, has it remained as a Parisian landmark? Describe some of the other buildings constructed for the exposition and detail their uses.
What historical reason was there for holding the World Exposition in Chicago? Describe the buildings constructed for this exposition and explain why they were built in this way. Explain what the general style of these buildings was supposed to represent and how landscaping helped generate a sense of unity throughout the fair area.
In the years since these two expositions, there have been quite a number of World Fairs, and we associate certain structures as symbolic of them. For example, the Seattle Worldâ??s Fair left us with the Space Needle, the Worldâ??s Fair in Brussels gave us the Atomium, and New York Cityâ??s Worldâ??s Fair was symbolized by the Unisphere.

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The historical reason for the Paris Exposition was the Centennial of the French Revolution. Gustave Eiffel created the Eiffel out of cast iron and it was nicknamed the Iron Lady. There were unusual thunderstorms in Paris, causing distress among the visitors to the Exposition. With the Galerie des Machines, a floating construction of iron girders bridged a large span, visitors to the Exposition enjoyed a variety of steam engines and elctrodynamos. The elegant, curved arches were held together by a bolt so that any fluctuation in temperature caused the structure ...

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Cite expositions and describe their historical significance in conjunction with examples from each one cited.