For more than a decade, the N.F.L. has offered a roughly nine-figure quid pro quo with American cities: Invest hundreds of millions of dollars of public money in a stadium, and a Super Bowl will come.

Seven N.F.L. stadiums have been built in the last 12 years. By 2020, all will have hosted the country’s biggest sporting spectacle. When new stadiums open near Los Angeles and in Las Vegas during the next decade, they will get a Super Bowl, too.

New stadiums, supported by as many public dollars as possible, have long been one of the league’s priorities. To get funds for them, the N.F.L. dangles the prospect of playing host to a Super Bowl and its promised riches.

Depending on what, exactly, constitutes a public dollar, taxpayers contribute an average of about $250 million to build N.F.L. stadiums, according to the advisory firm Conventions, Sports & Leisure International. For U.S. Bank Stadium in Minneapolis — which opened in 2016 and will host the Super Bowl on Sunday — the state of Minnesota spent $348 million and the city kicked in an additional $150 million, a bit less than 50 percent of the stadium’s total cost.

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