What is the significance of the first Monday in September?

The significance of the first Monday in September is that it is recognized as Labor Day in the United States. Labor Day serves as a tribute to the contributions and achievements of American workers and is often seen as a day to celebrate the labor movement and the rights of workers. This holiday marks the unofficial end of summer and is associated with various festivities, including parades and family gatherings.

The other choices represent different holidays with distinct themes. Memorial Day, which occurs later in May, honors those who have died in military service. Independence Day celebrates the adoption of the Declaration of Independence on July 4th and is associated with patriotic displays. Thanksgiving, celebrated in November, emphasizes gratitude and harvest. Each of these holidays has its unique significance, but none correspond to the first Monday in September as Labor Day does.