As a government agency, the U.S. Post Office will close offices on Labor Day, and no regular mail or packages will be delivered throughout the day. More From Newsweek Vault: Online Banks vs.

Labor Day was officially established and signed into law by President Grover Cleveland in 1894 to recognize the contributions of American workers. Smithsonian Libraries houses many books dealing with ...

The first Monday of September, Labor Day serves as summer's unofficial last hurrah. The three-day weekend is a last-ditch opportunity to soak up the waning rays of sunshine before fall sets in ...