Answer
The Philippine Independence Day commemorated by Diosdado Macapagal marked the anniversary of the Philippine Declaration of Independence from the Spanish Empire. This significant event, which occurred on June 12, 1898, symbolized the nation's liberation from Spanish colonial rule and the birth of the First Philippine Republic. Macapagal's recognition of this historic milestone solidified June 12 as the official Independence Day, paying tribute to the nation's struggle for freedom and self-determination.