Thick Bottom Border

This is one of the funny Trump Memes - It is a little bit subtle (which means that it is way more subtle than most political memes)

The part that is funny about it is that the reader probably has no idea what is going on when they start at the top of the meme, but eventually they realize that this is a reference to Trumps wall (the one that he wants to build between the US, and Mexico).

This meme might also be utilizing unusual logic - assuming that since he wants to build a wall south of the US, he wants to divide everything from what is south of it.