5 things to know for June 19: Flood threat, Iran agreement, Moscow attacks, immigration, reflecting pool

By Alexandra Banner, CNN Many Americans today will celebrate Juneteenth, the federal holiday commemorating the end of slavery in the US. A blend of the words “June” and “nineteenth,” it marks June 19, 1865, when Union Army Maj. Gen. Gordon Granger arrived in Galveston, Texas, and proclaimed that enslaved African Americans there were free. Here’s