To start, a tidbit from  OZY Sunday Magazine : If the problem is the U.S. border with Mexico, is the solution an alligator-filled moat? In 2019, former President Donald Trump   reportedly asked aides   to explore that idea. In a response worthy of Jonathan Swift, defense strategist and author Peter W. Singer worked out the costs of replacing border fences with a moat filled with alligators and snakes. Spoiler alert: It’s   surprisingly doable , costing $2.5 billion to acquire the reptiles and $1.8 billion a year to maintain them as a “border force.” The Rio Grande is 1255 miles of the 1954-mile long U.S.-Mexico border.  If Donald Trump had succeeded in totally building a wall at a projected cost of $20 million/mile, the cost would eventually have been $39 billion.  He was planning, though, to only construct 576 miles at a cost of $11 billion, using the Rio Grande as part of his barrier, and some previous walls to suffice.  Gobal warming has made it easier to cross the Rio now, so this