Who was the first person laid to rest in the tomb of the unknown?

The first person laid to rest in the Tomb of the Unknown Soldier in Arlington National Cemetery was an unidentified American soldier from World War I. This soldier was interred on November 11, 1921, during a ceremony that honored the sacrifices of those who served in the war. The tomb has since become a memorial for unidentified soldiers from subsequent conflicts, representing all those who have died in military service.