"Sure do, they call em 'Trabants' over there, but have a lawyer explain civil liability to you, Lew, I'm just an old gumshoe guy, all's I know is there's a couple a thousand hunkies down to the Yards come over here with hate in their hearts for this bird and his family, maybe with good reason, too. If it was just the wholesome educational exhibits on the Fairgrounds and all why I wouldn't be too concerned, but the book on young Francis Ferdinand is, is he prefers our own New Levee and high-life neighborhoods like that. So every alleyway down here, every shadow big enough to hide a shive artist with a grudge, is a warm invitation to rewrite history."
* * * * * * * * * *
"'Trabants'"
The word means "companion." That's a pretty euphemistic term for a bodyguard. "These eighteen large men are my companions." I wonder if Tolkien was using the term "companion" in this sort of way in The Lord of the Rings? Frodo didn't have eight companions; he had eight bodyguards.
"civil liability"
Why would Lew have to concern himself with civil liability if Ferdinand gets hurt? My guess is that Ferdinand must have hired White City Investigations as extra protection. Your Trabants, being in foreign territory, might not know what kinds of dangers to watch out for. So it's always best to hire a local guide as a bodyguard. I should have remembered this advice, having heard the song "You Can Call Me Al" at least ten thousand times.
"couple a thousand hunkies down to the Yards"
This is the first time I've heard the slur "hunkies." It's a disparaging term referring to a person from East-central Europe, especially, like those hunkies down at the Yards, laborers. I guess East-central Europeans really fucking hated Archduke Ferdinand. They aren't going to kill him on this trip though, probably because Ferdinand's got a good driver this trip and not a stupid driver who makes a stupid wrong turn down the stupid wrong alley to wind up face-to-face with a stupid assassin who previously stupidly missed his chance to kill the stupid Archduke.
"maybe with good reason, too"
In high school, you learn that World War I began because Archduke Ferdinand was assassinated but they really lay off all the ethnic cleansing that was behind it. Maybe that was just my high school. To be absolutely fair, maybe it was just my attention span.
"he prefers our own New Levee and high-life neighborhoods"
The Archduke wants to explore places other than the World's Fair. Places where—gasp!—anarchists might be lurking!
"So every alleyway down here, every shadow big enough to hide a shive artist with a grudge, is a warm invitation to rewrite history"
This is pretty good foreshadowing of Archduke's eventual demise! I wonder if Gavrilo Princip thought, when he saw the Archduke's car trying to make a three point turn in a tight alley, thought, "A-ha! An invitation to rewrite history!", set down his coffee, and casually strolled into the history books.