what are the charactertstils of American economy?
what are the factors that contrident to the rapid development of American economy?



ps:英语回答~!!谢谢!!!尽可能详细些许~!!

Characteristics:
Large farms produce good food, but only about 2% of the population live and work on the farms.
Manufacturing is going down. About 25% of all goods are imported from other countries.
Service is now the largest part of the economy.
Until recently, real estate (residential and commercial) was a large part. Now both sectors are falling apart.
The population is aging so healthcare is growing. Some say it is the number one industry now. There is a shortage of nurses, so many are coming from other countries.
The hospitality industry (restaurants and travel) is the second largest segment.

Also important is that the population is becoming very diverse. Already in some states (like California) there is no majority group - only all minorities. Many say that the diversity is a strength for the U.S. economy to help develop markets in other countries.