It is the first Monday in September and school is closed. But do you know why? It's Labor Day, of course! Turn the pages of this book to find out: why parks are crowded on Labor Day, why children today go to school and do not work in factories, why Americans rest on a holiday that celebrates working. Each book in the Holiday Histories series describes one of America's holidays or special days. Explore the history of each day and learn the real reason...