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Here are new additions to The Best Sites To Learn About Walls That Separate Us (you can find tons of other related resources at The Best Sites For Learning About Immigration In The United States):

Building Walls Is Not A Solution To A Problem, Author Says is from NPR.

Built to Separate: Border Barriers Around the World is a photo gallery from The Atlantic.

When Is a Border Just a Border? Almost Never is from The NY Times.

Embattled Borderlands is an Esri Map interactive.