• The standard US voltage is 110 volts so you will need a transformer if you're coming from out of the country or you can sell your electrical goods before you come and buy new ones when you get here.
• Standard drinking age is 21 in every state.
• The date is written stating the month first, then the day, then the year. For example, the 6th of September 2007 is written September 6, 2007 or 9/6/2007.
• Public Holidays:

  January 1	New Year's Day
  3rd Monday in January	Martin Luther King Day
  3rd Monday in February	President's Day
  Last Monday in May	Memorial Day Weekend
  July 4	Independence Day
  1st Monday in September	Labor Day
  2nd Monday in October	Columbus Day
  November 11	Veterans Day
  4th Thursday in November	Thanksgiving Day
  December 25	Christmas

Further information

• Public Holidays of the US from Wikipedia
• Metric conversions and US customary unit conversions