The United States is a young country. Its written history is only a few hundred years old. It is sometimes, in fact called the New World. Over the last four hundred years millions of people have come to start a new life in this New World, Americans are not afraid of new ideas. They built the first skyscrapers. They like to be modern. They like exciting, modern cities, new houses, and new cars. At the same time, Americans love old things. They like to visit historic houses and museums.