Tottenham are now a global brand – and the latest developments from the United States show just how far they have come. Daniel Levy and the rest of the Spurs hierarchy have made no secrets about their ambitions to grow the overseas profile of the club. This summer, Spurs will tour Japan. The impact of players from certain territories can occasionally be overstated, but Son Heung-Min has demonstrably helped the club soar in East Asia. With the club to a certain extent limited in what they can earn from matchday and TV income, they have zeroed in on commercial revenue streams as a key growth are…