The USA has some of the biggest cities in the world, and more than three-quarters of its people live in cities or towns. This mean that there are also some very empty places, which have not changed much since the first Europeans arrived. The government has kept some of them as national parks, beautiful natural places where people are not allowed to build houses or factories. Many artists have photographed the beautiful park of America. One of the most famous is Ansel Adams, who was born in San Francisco a few years before the earthquake of 1906. Two of his favorite places were Yosemite in northern California, which has been a park since 1890, and the coast of California.
Travelling north from California, you come to Oregon and then Washington. These states are cool and cool and wet, but very beautiful, with big forests and high mountains. Here you will find a number of national parks like Mount Rainier and Crater Lake.