Make sure you have your passport and boarding pass with you. Depending on your country of origin, arrange your visa or other required documentation well in advance.
The US climate is very diverse due to its large geographical area. Generally speaking, summers are hot and humid on the plains and in the southern states, while the southwest is very hot and quite dry.
Boston, Miami and New York = GMT - 5
The US is a federal presidentialist republic composed of 50 states. It shares land borders with Canada and Mexico and maritime borders with Russia, Cuba and the Bahamas, as well as Canada and Mexico.
The US currency is the US Dollar (USD). It is expected to give a tip of 10 to 15%.
The official language is English. Some useful phrases in English are: “hello” = hello; "Please” = please; "Thank you very much” = Thank you very much; “Sorry” =Sorry.
Business related breakfasts, lunches and dinners are common. Americans are direct in their communication, and they like eye contact when they are talking to someone. Typically, it is not important to develop a personal relationship to establish a successful business relationship.
Do not smoke in public locations. If in doubt or if you are in someone's home, always ask before smoking. Do not invade someone else's personal space too much - Americans usually like to leave some space between them when they are talking.
You can choose different levels of formality depending on the part of the country where you are and the industry. When in doubt, opt for a conservative style, and adapt it as needed.
When meeting someone in a business context, greet him or her with a firm handshake. In social situations, it is normal not to individually greet all the people. A general "hello" or "hi" is sometimes sufficient. If you are invited to someone's house, offer a bouquet of flowers or a bottle of wine to show your appreciation. Addressing people by their first name is normal - if in doubt, use the appropriate title with the surname.