There are a lot of shades to life in the US that you can only learn by living there. But,we shall see some of the more important cultural differences

Stereotypes

Americans do tend to be more informal than people from other countries. It is common for Americans to wear casual clothing to school and to greet professors by first name. But, good manners and politeness are always appropriate. If you are courteous and polite, and dress a little more formally than your American friends, it will only reflect well on you.

However, there are situations and environments in which formality is the norm. Some businesses require their employees to wear a uniform or a suit. It would be inappropriate to wear a T-shirt and blue jeans to a job interview. Some of the more prestigious restaurants require a coat and tie. Americans tend to dress up for cultural events (the opera, theater and ballet) and to dress down for athletic events. Formal wear is required at weddings and funerals, or any other event with religious overtones.

Forms of Address

American names are written and spoken with the given name first and the family name last. So John Smith's family name is Smith, not John.

In an informal situation, Americans will introduce each other by first name, without titles, and occasionally by just the last name. If you are introduced to somebody by first name, you can address him or her by first name the next time you meet. The only exception would be for someone who holds an important position, such as the university president. Unless they tell you otherwise, faculty should be addressed using their title and last name (e.g., "Professor Smith").

Tipping

Restaurants do not include a service charge in the bill, so you should tip the waiter 15% of the total bill

Taxi drivers expect to get a tip equal to 15% of the total fare.

Business Visits

Business visits, on the other hand, tend to be extremely punctual. If you arrive late to a business appointment, it will reflect badly on you. So try to arrive on time, or even a little early. If you know that you will be arriving late, you should telephone ahead to let them know of the delay.

Telephone Manners

When you call someone, it is polite to identify yourself.

Dining

Most Americans eat three meals during the day: breakfast, lunch, and dinner. Breakfast begins between 7:00 and 8:00 am, lunch between 11:00 am and noon, and dinner between 6:00 and 8:00 pm. On Sundays "brunch" is a combination of breakfast and lunch, typically beginning at 11:00 am. Students often enjoy a "study break" or evening snack around 10:00 or 11:00 pm.
Breakfast and lunch tend to be light meals, with only one course. Dinner is the main meal.

Gifts

If you wish to give a gift when you leave to return to your home country, the best gift is something that is unique to your country. It does not need to be especially valuable or rare, just reminiscent of your home. Possibilities include a book about your country, an inexpensive handicraft or piece of art, or something else that reflects your culture.

If you owe a debt of deep gratitude to an American host family, a common way of repaying it is to take the family to a form of entertainment, such as a baseball, basketball, or hockey game, the ballet, or to a good restaurant.

Smoking

Smoking has become socially unacceptable in the US, in part due to the health risks. Smoking is prohibited in government and public buildings, and many businesses, especially restaurants, will not permit smoking on the premises. Those restaurants that permit smoking will usually have a separate section for customers who smoke. Your school probably has a ban on smoking within campus buildings or near building entrances.

Numbers

In the United States, the number 13 is symbolic of bad luck. Tall office buildings sometimes skip the number 13 when numbering the floors.

The number 7 is symbolic of good luck.

Calendar Dates

In the United States, dates are written as month/day/year. This is the opposite of the British method, in which dates are written day/month/year. So while 4/3/67 would be March 4, 1967 in Europe, it is April 3, 1967 in the United States. It is best to write out dates using the month name in order to avoid confusion

Calendar Dates

In the United States, dates are written as month/day/year. This is the opposite of the British method, in which dates are written day/month/year. So while 4/3/67 would be March 4, 1967 in Europe, it is April 3, 1967 in the United States. It is best to write out dates using the month name in order to avoid confusion.

Time and Temperature

Climate varies considerably across the United States. You will probably need an umbrella, even in Las Vegas or Los Angeles. In the northern cities, such as Boston, Chicago, Pittsburgh, New York, Seattle, Washington, Denver, and Minneapolis you will need cold weather and snow gear. In the southern states, such as California and Florida, summers may be very hot and the winters mild. Depending on the part of the country, temperatures during the summer will run from the 70s through the 90s.

No matter where you are in the US, you will probably need a sweater or jacket for part of the year. If you will be living in an area that gets snow, you will need a good winter coat, boots, and gloves. If the coat does not include a hood, you will need a hat that covers your ears. But all this can wait until after you arrive in the US. Clothing is relatively inexpensive in the US, and it may be easier to find appropriate clothing at your destination. Wait until you arrive, and watch what the natives wear.

During Daylight Savings Time clocks are set forward one hour. It begins on the first Sunday in April and ends on the last Sunday in October. The mnemonic "Spring Forward, Fall Back" will help you remember how to set your clocks.

Electronic Equipment

Most electrical outlets in the United States operate with a voltage of 110-120 volts, 60 cycles. If your equipment requires 220 volts, bring a transformer and plug adapter.
Videotapes recorded on foreign VCRs will not necessarily play correctly on American VCRs.

If you are thinking of buying a computer to bring with you, you may wish to wait until after you arrive in the US to get a computer. Computer and software prices are often less expensive in the US, and getting cheaper every day.

Religion

The US Constitution guarantees religious freedom for all faiths. You will almost certainly be able to find a church, synagogue, or mosque near school for people of your faith.

International Visitors Council

Your city may have an organization that tries to help international visitors during their stay in the United States and to help familiarize them with American customs. Some of the services typically offered include matching you with a host family who will spend an evening with you, tours of the city, visits to factories and businesses, and social events. They might also offer English lessons and holiday hospitality.

Ask your friends and colleagues whether the city has such an organization, or look in the yellow pages.