steam trains, ships & border guards invented together

Let us try to capture the full blown sexual-political panic never far below the surface of your average middle class Victorian paterfamilias :

"The deeper that the miscegenating steam ship and train try to penetrate into our hitherto virgin territories around the globe, the faster we must have border guards and passports erected to parry their thrusts and keep those territories pure."

It might all be just a big coincidence that nationalism rhetoric became rampant at the very moment when easy international travel for the masses first became practical , but as the TV detective says, 'I don't believe in coincidences'....