The 2026 World Cup is generating a veritable army of modern-day de Tocquevilles discovering America.Why it matters: It's a huge moment for U.S. soft power, as the country nears its 250 birthday with a mixed global reputation at best.Driving the news: Boston welcoming Scottish fans is the off-the-pitch story of the tournament so far.The Scots seem enamored with Beantown, and vice versa.They drank the Sam Adams brewery dry. They brought soccer sup…