Name two national U.S. holidays.

The identification of Christmas and Thanksgiving as national U.S. holidays is accurate because both days are designated as official federal holidays. Thanksgiving is celebrated on the fourth Thursday of November, and it is a time for family gatherings and gratitude. Christmas, celebrated on December 25, honors the birth of Jesus Christ and is widely recognized and celebrated across the nation.

While Labor Day and Memorial Day are also federal holidays, the combination of Christmas and Thanksgiving represents two distinctly significant cultural and historical celebrations in the United States. Easter and Halloween, on the other hand, are not designated as federal holidays, and Valentine's Day, while celebrated widely, is also not recognized as a national holiday. Hence, Christmas and Thanksgiving stand out as widely observed national holidays.