On the Fourth of July when the United States of America won it's independence to become it's own country.
Because it was the day our country had won freedom from Britain. This day the Declaration of Independence was written.
Independence Day 2010, or Fourth of July in 2010 will be on Sunday, July 4, 2010.
In the US, July 4, 1776 in Phlidelphia.
Independence Day is on the 4th of July. God Bless The U.S.A