eloheinu, melech ha-olam, shehechayunu, v’kimanu, v’higianu la’zman hazeh.
This is the Hebrew prayer of thanks for having been allowed to live to see something new. (And yes, Hebrew “baruch” is cognate with Arabic/Swahili “barack”: both mean “blessed.”)
I had a party tonight, and when Obama went out on that platform several of my guests started to chant the prayer.