Children on a littered Chinatown street

In the 19th century, a majority of Chinese immigrants were single men who worked for a while and returned home. At first, they were attracted to North America by the gold rush in California. A relatively large group of Chinese immigrated to the United States between the start of the California gold rush in 1849 and 1882, before federal law stopped their immigration. After the gold rush, Chinese immigrants worked as agricultural laborers, on railroad construction crews throughout the West, and in low-paying industrial jobs. Soon, many opened their own businesses such as restaurants, laundries, and other personal service concerns. With the onset of hard economic times in the 1870s, European immigrants and Americans began to compete for the jobs traditionally reserved for the Chinese. Such competition was accompanied by anti-Chinese sentiment, riots, and pressure, especially in California, for the exclusion of Chinese immigrants from the United States. The result was the Chinese Exclusion Act, passed by Congress in 1882. This Act virtually ended Chinese immigration for nearly a century.

The history of New York City's transportation system. New York City is distinguished from other U.S. cities for its low personal automobile ownership and its significant use of public transportation. New York is the only city in the United States where over half of all households do not own a car (Manhattan's non-ownership is even higher, around 75%; nationally, the rate is 8%). New York City has, by far, the highest rate of public transportation use of any American city. New York City also has the longest mean travel time for commuters (39 minutes) among major U.S. cities. The Second Industrial Revolution fundamentally changed the city – the port infrastructure grew at such a rapid pace after the 1825 completion of the Erie Canal that New York became the most important connection between all of Europe and the interior of the United States. Elevated trains and subterranean transportation ('El trains' and 'subways') were introduced between 1867 and 1904. Private automobiles brought an additional change for the city by around 1930, notably the 1927 Holland Tunnel.