[Blue Jays]

"...protective barrier..."

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United States side of the wall should be covered with high-quality solar panels for clean, green, renewable energy.
Leftwingers will not know what to do with themselves with such a big conundrum. LOL.

[ASA Vet]

The US Side is the north face of our wall. The sunshine will be on the south face.

Of course just their presence, even though they'd be useless, would be enough to confuse the Commies.