Friday is July 4th, when America celebrates its Independence Day. Here's a look at what's open and what's closed in Massachusetts. The Fourth of July is a state and federal holiday. That means the post office, courts, schools, government offices, town halls and public libraries are closed.

Also known as Independence Day, the holiday celebrates the Second Continental Congress’s unanimous adoption of the Declaration of Independence, which occurred on July 4, 1776. The document also marked the establishment of the United States as a sovereign nation,