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Unlike most other countries the United States has virtually no public holidays on which all employees in the country receive a day off of work and all business is halted. Each state may have different state holidays but all observe the annual federal holidays, however, they may alter the dates of observance or add or subtract holidays according to local custom. In Manhattan there is no day that everything is closed there are always supermarkets pharmacys and most likley a few cafes and resturants open even on federal holidays which usually see only banks and other financial institutions closed
Below is a list of the annual federal holidays in New York
New Year's Day 1st January - Celebrates beginning of the Year
Martin Luther King Jr Day - Third Monday in January
President's Day - Washington's Birthday
Memorial Day - Last Monday in May
Independence Day 4 July - Celebrates the signing of the Declaration of Independence
Labor Day - First Monday in September - Celebrates workers and the labor movement
Columbus Day Second Monday in October - Honors Christopher Columbus
Veterans Day / Armistice Day 11 November - Honors all veterans of the United States
Thanksgiving Day - Fourth Thursday in November - Traditionally celebrates the giving of thanks for the autumn harvest
Christmas Day 25 December - Traditionally celebrates the birth of Jesus.