Happy Birthday to America! (Yes, on the second) The Fourth Day of July 1776 is the day that the Continental Congress voted to adopt the wording of the document that would become known as the Declaration of Independence, which expressed the notion of the 2 July vote in which actual independence was declared.
2 July – America’s Birthday
4 July – Independence Day (Formal celebration of such)
Really it’s a ploy to stretch out the BBQ party.