I would say that building the Vatican walls to fend off pirates and other invaders over twelve centuries ago is a heck of a lot different than keeping out people who want to come here to work. Not even the all-but-forgotten caravan is coming armed and dangerous. Face it, trump hates brown people except for those here illegally who do the grunt work on his properties.
A paragraph from
this article says it all.
"The situation is not “immigration enforcement” in any meaningful sense. Instead, it's a reprise of historical pattern of exclusion, displacement and oppression that has always surrounded the nation’s southern boundary — lines of class, race, gender and culture are deliberately drawn to police a social gateway to the country. And to President Trump, these refugees are the wrong kind of people."