good morning. i'm poppy harlow. >> i'm jim sciutto. hours from now, president biden will leave the white house for oklahoma to commemorate the 100th anniversary of the tulsa race massacre. it is just a horrific and sadly, a long ignored chapter in this nation's history. on may 31st, 1921, a white mob descended on what was a thriving black neighborhood, greenwood, in tulsa. angry crowds went block to block. they looted. they killed. eyewitnesses reported planes, a relatively new invention at the time, took part in the attacks. attacks from the air. the destruction and devastation lasted until the next day. and the scenes afterwards just horrendous. >> not just homes and businesses, but schools and churches also destroyed. the very heart of that community burned to the ground. thousands were left homeless as many as 300 black americans were