Those were some of the questions that we had in mind when we set out to see, film and map every foot of the U.S.-Mexico ... from crossing. But the longest contiguous unfenced stretch of border ...

The scale of illegal border ... Arizona, Texas and New Mexico, have topped the list, New York, Florida and Washington between them saw well over 150,000 attempted illegal crossings in a year.

President Donald Trump is already following through on campaign promises he made to crack down on the flow of migrants ...

Senior Field Correspondent Nina Kravinsky, a former NPR producer, is reporting from the station's news bureau in Hermosillo.