With the coming of the 20 12 London Olympic Games, I want to travel to Britain and learn more about British history and culture. Please write an English composition (120-150).

Between the two world wars-Civil War and World War I-the United States of America came of age. In less than 50 years, it has changed from a rural republic to a city state. The border disappeared. Huge factories and steel mills, transcontinental railway lines, prosperous cities and vast agricultural land mark this land. With economic growth and prosperity, there are corresponding problems. Across the country, enterprises began to dominate the whole industry independently or jointly with other enterprises. Working conditions are often poor. Cities are developing so fast that it is impossible to properly accommodate or manage the growing population.

"The civil war," said a writer, "left a wide gap in the history of this country; It suddenly dramatically shows the changes that have taken place in the past two or three decades ... "The need of war has greatly stimulated the manufacturing industry and accelerated the economic process based on the utilization of iron, steam and electricity, as well as the progress of science and invention. In the year before 1860, 36,000 patents were authorized; In the next 30 years, 440,000 patents were issued, and in the first quarter of the 20th century, the number reached nearly one million.

As early as 1844, Samuel F. B. Morse perfected the telegraph technology, and soon after, the distant parts of the European continent were connected by a network of telephone poles and wires. Alexander Graham Bell demonstrated a telephone instrument. In half a century,16 million telephones will accelerate the social and economic life of this country. The invention of 1867 typewriter, 1888 adder and 1897 cash register accelerated the development of commerce. The movable type typesetting machine, rotary printing machine and origami machine invented in 1886 made it possible to print 240,000 eight-page newspapers in one hour. Thomas Edison's incandescent lamp finally lit up millions of families. The sound machine, or phonograph, was also perfected by Edison. Together with george eastman, Edison also helped develop the film. These and many other applications of science and originality have led to a new level of productivity in almost every field.

At the same time, the country's basic industry-steel-is developing under the protection of high tariffs. The iron and steel industry, which used to be concentrated in the eastern states, moved westward, because geologists discovered new deposits, especially the Great Mesabi Iron Mine in the upper reaches of Lake Superior, which became one of the largest ore producing areas in the world. This kind of ore is located on the surface of the earth, and it is easy and cheap to mine. Because it contains no chemical impurities, it can be processed into high-quality steel, and the cost is only one tenth of the previous one.