Before WW1 Glasgow alone had the three grandest stadiums in the world... by 1902 Ibrox had a capacity of 75,000. From the very earliest days even the English game was largely populated with Scottish players. The Scottish invented the passing game. If you have the slighest interest in the game, and its global history, I would strongly recommend The Ball Is Round by David Goldblatt. Really the finest work on footy history without a doubt. Incidently those three stadiums (Ibrox, Celtic Park, Hampden Park), like many many others, were the work of Archibald Leitch. There are very few that survive, but next time you watch Fulham, the Main stand at Craven Cottage is his, and the facade (only) of the Ibrox Main Stand is also his.