Maybe you haven't, but there's no nuance this this meme.
Borders are not that old, and they come and go and move for political, safety, and many other reasons. The current Mexico border is being used as a political weapon against and a shield/filter for some of the many political and policy mistakes we've made in Central and South America (Guatemala, Venezuela, etc.), and it's fallout will be seen for generations.
There you go using the pejorative "illegals" term.
I think we all understand what borders are as well as any normal citizen. What I doubt we can agree upon is what the Southern border is being used for right now. Or why a stack of wood is being used to protect a neighborhood being raided by some ill trained, violent, and ill intended federal troops.