Standing on a portable stage erected at home plate of the Milwaukee Brewers ballpark, Wisconsin Gov. Tony Evers recently praised the professional baseball team as an “essential part” of the state's “culture and identity” and “economic success.” With fanfare, Evers then signed off on $500 million in public aid for the stadium's renovation, adding to a remarkable run of such blockbuster deals. This year alone, about a dozen Major League Baseball and National Football League franchises took steps toward new or improved stadiums. A new wave of sports facility construction is underway. One driven, in part, by a race to...