Chicago fire (1871) October 1871 8 to 10 Chicago fire, about 6.5 square kilometers of land in the city (including commercial) building almost all was burned, about 300 people were killed and nine million homeless, property damage up to 2 billion dollars. This is the famous American historil Chicago fire. Fire rebuilt after (1871 years) in 1871 Chicago after the fire, Chicago get fast reconstruction and quickly restored the growth. The reconstruction period, here in the world the first produced by steel truss skyscrapers, which began Chicago innovative city buildings in the world scope of reputation. In 1893, Chicago hosted the world expo, get great Columbus success, altogether attracted to 2750 million visitors. In previous year, university of Chicago also in this created.Pollution treatment (1900) due to the rapid population growth and the development of industry and commerce, as the main source of the city on the edge of the lake Michigan in this period was seriously polluted. To solve the water pollution, city square in the lake Michigan is two miles of building a waterworks water entry, and through the underwater pipeline bring water into the city water supply system. But such efforts effect was proved to be limited because of the rain may get Chicago river sewage into water entry nearby. In 1900, the problem finally get be relaxationed thoroughly solved. People through the construction level ascension facilities and gate, will originally the Chicago river flows into lake Michigan, make its reversal of flow to surged southward Illinois river. Since then, the urban sewage no longer infuse lake Michigan.
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