 <translate> The relevant information to answer the above question is: Subsequently, the Pledge was first used in public schools on October 12, 1892, during Columbus Day observances organized to coincide with the opening of the World's Columbian Exposition (the Chicago World's Fair), Illinois. So, the answer is October 12 , 1892. <yor> Ìsọfúnni tó ṣe pàtàkì láti dáhùn ìbéèrè tó wà lókè yìí ni pé: Lẹ́yìn náà, wọ́n bẹ̀rẹ̀ sí lo Ẹ̀jẹ́ náà fún ìgbà àkọ́kọ́ láwọn ilé ẹ̀kọ́ ìjọba ní October 12, 1892, nígbà ayẹyẹ Columbus Day tí wọ́n ṣètò láti bá ìbẹ̀rẹ̀ World's Columbian Exposition (ìyẹn Ibi Ìpàtẹ Àgbáyé ní Chicago, Illinois) dọ́gba. Nítorí náà, ìdáhùn náà ni October 12, 1892. 