America celebrates its Independence Day on the Fourth of July every year. In 1776, the USA got its Independence from the British. Though the Continental Congress voted to declare Independence on the 2nd of July, they approved the final wording of the Declaration of Independence on July Fourth, 1776. They'd been working on it for a couple of days after the draft was submitted on July 2nd. So, July fourth, 1776, is a day that represents the Declaration of Independence and the birth of the United States of America as an independent nation.
Initial years Americans were busy with other things and celebrations didn't take place. But celebrations of the 4th of July became more common as the years went on and in 1870, almost a hundred years after the Declaration was written, Congress first declared July 4 to be a national holiday as part of a bill to officially recognize several holidays, including Christmas.
This important day for the Americans is marked with grand celebrations - bursting of fireworks, parties, basketball games, family reunions, etc. The Bristol, July Fourth Parade in Rhode Island is the oldest continuous Independence Day celebration in the US.