| A | B |
|---|
| megalopolis | a region where cities and suburbs have grown so close together that they form 1 big urban area |
| population density | the average number of people per square mile |
| Washington D.C. | the capital of the U.S. |
| industrialization | changing from an agriculture-based economy to an industry-based economy |
| forty-niners | the first miners and prospectors of the California Gold Rush |
| commute | to travel to work |
| Sun Belt | Area of the U.S. that stretches from the southern Atlantic coast to California |
| mass transit | a system that replaces individual cars with energy-saving buses or trains |
| recession | a downturn in business activity |
| Ellis Island | from 1892-1954 immigrants came to the U.S. through here |
