"States have been building walls since ancient times. Some were arguably quite successful, others less so. At the core of prudent policy lies a basic question: What can walls realistically accomplish?"

"States have been building walls since ancient times. Some were arguably quite successful, others less so. At the core of prudent policy lies a basic question: What can walls realistically accomplish?" https://t.co/F90SncH7HB

— RAND Corporation (@RANDCorporation) January 21, 2019