The city of Washington, the capital of the United States of America is located in the District of Columbia (DC for short) Many people consider Washington DC to be one of the most beautiful cities in the world. It is filled with many parks, wide streets and impressive buildings. In the center of the city, in Capitol Park, visitors' eyes focus on the Capitol, where Congress meets to make laws.
The surge in population is both a cause of the changed relationship and one of the clearest illustrations of how startling the change has been, especially when viewed in a historical context. From the emergence of modern humans 200,000 years ago until Julius Caesar\'s time, fewer than 250 million people walked on the face of the earth. When Christopher Columbus set sail for the New World 1,500 years later, there were approximately 500 million people on earth. By the time Thomas Jefferson wrote the Declaration of Independence in 1776, the number had doubled again, to I billion. By midway through this century, at the end of World War II, the number had risen to just above 2 billion people.
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