How New York Became America?s Largest City
New York was once smaller than Philadelphia and Boston，but now it is America?s largest city because of geography，history and economics.
New York was located at the seaport where materials were imported to the US and the products of the US were sent abroad across the sea.The city was further developed when the Erie Canal was completed in 1825.This linked Lake Erie to New York via the Hudson River and the cost of transporting goods to those who had settled inland was cut down.In addition， the Great Lakes were soon linked to the Mississippi.Later，railroads tied New York closer to the central states，whose goods were exported via New York.Fewer goods were imported，so cheap passages were available from Europe.New York became the main port for receiving Europeans，many of whom stayed in the city and helped it become great.
另附摘要基本交代句，这些句子只是拿分的必要条件，还是应该把我上面讲的东西好好想想
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