Next year, the United States will observe the 250th anniversary of its Declaration of Independence. To begin a year of celebration, Donald Trump appeared at the Iowa State Fairground in early July. “We’ve saved our country,” he proclaimed to the crowd of supporters. Trump then announced a “giant patriotic festival” on the National Mall for next summer, and suggested an Ultimate Fighting Championship event could take place on White House grounds. UFC is one of the corporate sponsors of America250, the nonprofit organization that will be overseeing the country’s semiquincentennial celebration. Other sponsors represent different parts of Trump’s corporate coalition:...