...and you shall know it by the trail of dead.
More people have died illegally crossing the southwestern border of the United States in the last 16 years than were killed in the Sept. 11, 2001, terrorist attacks and Hurricane Katrina combined. From October 2000 through September 2016, the Border Patrol documented 6,023 deaths in Arizona, California, New Mexico and Texas, while more than 4,800 people died in the Sept. 11 attacks and Hurricane Katrina.
For a really really excellent book-length treatment, see Jason DeLeón's The Land of Open Graves. I read it for an anthropology course a few weeks ago and sections had me in tears.