Almost 4,000 migrants have died or gone missing traveling to the U.S.

Almost 4,000 people have died or gone missing while trying to migrate to the U.S. through Mexico since 2014, the Associated Press reports.

Why it matters: The AP's tally is 1,573 more people than what has been previously reported by the UN, and it's likely still an underestimate as some migrants are missing or unreported — and it's just part of the total number of 56,800 migrants that have died or gone missing around the world in that time.