#onThisDay in 1971 #JohnStewart debuted in #GreenLantern #comics #87 #architect selected by #TheGuardiansOfTheUniverse #toTakeOverAsAlternateGreenLantern for #HalJordan65 when #GuyGardner is injured & whileTraining with Hal solves a case of #aSenatorWhoStagesAFalseShooting #toPromptRacialTension