Which holiday is celebrated to mark the United States' independence?

Independence Day, celebrated on July 4th, is the holiday that marks the United States' independence. This day commemorates the adoption of the Declaration of Independence in 1776, when the thirteen colonies declared their freedom from British rule. It is a significant national holiday that is observed with various celebrations, including fireworks, parades, and patriotic displays.

The other holidays listed do not mark the United States' independence. Memorial Day honors those who have died in military service, Thanksgiving is a harvest festival celebrated to give thanks, and Labor Day recognizes the contributions of American workers. Each of these holidays has its own distinct purpose and history, making Independence Day uniquely significant in relation to the nation's founding and freedom.