"In the nineteenth century some parts of the world were unexplored, but there was almost no restriction on travel.:; Up to 1914 you did not need a passport for any country except Russia.:; The European emigrant, if he could scrape together a few pounds for the passage, simply set sail for America or Australia, and when he got there no questions were asked.:; In the eighteenth century it had been quite normal and safe to travel in a country with which your own country was at war."

Source: George Orwell (1968). “The Collected Essays, Journalism, and Letters of George Orwell: As I please, 1943-1945”