2015年考研英语的摘要问题（二）

将下面这篇约500词的原文按要求写成约150词的摘要。

原文

How New York Became America?s Largest City

In the 18th century New York was smaller than Philadelphia and Boston.Today it is the largest city in America.How can the change in its size and importance be explained?

To answer this question we must consider certain facts about geography， history，and economics.Together these three will explain the huge growth of America?s most famous city.

The map of the Northeast shows that four of the most heavily populated areas in this region are around seaports.At these points materials from across the sea enter the United States， and the product of the land are sent there for export across the sea.

Economists know that places where transportation lines meet are good places for making raw materials into finished goods.That is why seaports often have cities nearby.But cities like New York needed more than their geographical location in order to become great industrial centers.Their development did not happen simply by chance.

About 1815，when many Americans from the east coast had already moved toward the west，trade routes from the ports to the central regions of the country began to be a serious problem. The slow wagons of that time，drawn by horses or oxen，were too expensive for moving heavy freight very far. Americans had long admired Europe?s canals.In New York State a canal seemed the best solution to the transportation problem.From the eastern end of Lake Erie all the way across the state to the Hudson River there is a long strip of low land.Here the Erie Canal was constructed. After several years of work it was completed in 1825.

The canal produced an immediate effect.Freight costs were cut to about one-tenth of what had been.New York City，which had been smaller than Philadelphia and Boston， quickly became the leading city of the coast.In the years that followed， transportation routes on the Great Lakes were joined to routes on the Mississippi River.Then New York City became the end point of a great inland shipping system that extended from the Atlantic Ocean far up the western branches of the Mississippi.

The coming of the railroads made canal shipping less important，but it tied New York even more closely to the central regions of the country.It was easier for people in the central states to ship their goods to New York for export overseas.

Exports from New York were greater than imports.Consequently，shipping companies were eager to fill their ships with passengers on the return trip from Europe.Passengers could come from Europe very cheaply as a result.

Thus New York became the greatest port for receiving people from European countries. Many of these people remained in the city.Others stayed in New York for a few weeks，months，or years，and then moved to other parts of the United States.For these great number of new Americans New York had to provide homes， goods， and services.Their labor helped the city be come great.

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