street together against all odds just as they did in 1921 an archaeological dig in search of victims' mass graves will resume at nearby oak lawn cemetery. and president biden is expected here in tulsa for the solemn anniversary. peter? >> antonia hylton, thank you. and this holiday weekend brought rain to large parts of the country, but not a drop where it is needed most. gadi schwartz tonight on the devastating drought in the southwest. >> reporter: across the american west there is a drought so vast it stretches from fire-ravaged california to drying lakes, rivers, and wells in utah, arizona, colorado and nevada and in new mexico on a ranch along the continental divide cattle pass through a pond that has been bone dry for years >> normally this pond would have water, probably eight, ten months out of the year >> reporter: like most surrounding states, about 80% of new mexico is under extreme drought, part of what scientists now consider a mega drought brought on by the changing climate and on this ranch it's