Assertion: football stadium | /r/HasProperty | built in the united states
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text: Before more modern football stadiums were built in the United States, many baseball parks, including Fenway Park, the Polo Grounds, Wrigley Field, Comiskey Park, Tiger Stadium, Griffith Stadium, Milwaukee County Stadium, Shibe Park, Forbes Field, Yankee Stadium, and Sportsman's Park were used by the National Football League or the American Football League.