Question:  The Philadelphia Spinners won the AUDL Championship over the Indianapolis AlleyCats at a stadium located in which US state ?

Context paragraphs:
2012 American Ultimate Disc League season: The 2012 American Ultimate Disc League season was the first season for the league.  Each team was scheduled to play a 16-game schedule.  The Philadelphia Spinners won the AUDL Championship over the Indianapolis AlleyCats at the Pontiac Silverdome.  After the season all but three teams (Detroit Mechanix, Indianapolis AlleyCats, and the Bluegrass Revolution) left or folded.

Indianapolis AlleyCats: The Indianapolis AlleyCats or Indy AlleyCats are a professional ultimate team that competes in the Midwest Division of the American Ultimate Disc League.  In their first year, the AlleyCats competed in the league championship, losing to the Philadelphia Spinners.

Philadelphia Phoenix (AUDL): The Philadelphia Phoenix are a men's ultimate team based in Philadelphia in the American Ultimate Disc League.  They are in the Eastern Division with the DC Breeze, New Jersey Hammerheads, New York Empire, Rochester Dragons, and Toronto Rush.  The team was introduced in the 2013 Season of the AUDL, replacing the Philadelphia Spinners, who left the league in 2012 to join Major League Ultimate.  The Phoenix plays its home games at A. A. Garthwaite Stadium in Conshohocken, Pennsylvania.  The Phoenix had their first franchise win on April 27, 2013 against the Rochester Dragons, winning 26 to 14 at home.

2013 American Ultimate Disc League season: The 2013 American Ultimate Disc League season was the second season for the league.  Each team played a 16-game schedule.  The Toronto Rush won the AUDL Championship II over the Madison Radicals in Chicago, IL.  The Rush completed the first undefeated season in AUDL history, going 16-0 in the regular season and winning both playoff games.

Brodie Smith (ultimate): Brodie Smith (born August 29, 1987) is an American Ultimate Disc League player and trick shot performer.  Brodie won two USA Ultimate College Championships playing for the University of Florida, as well as two National Club Championships, first in 2012 with Austin's Doublewide, and again in 2014 with Denver's Johnny Bravo.  He has played professionally with the AUDL's Indianapolis Alleycats, Chicago Wildfire, Dallas Roughnecks, and Jacksonville Cannons.

2015 American Ultimate Disc League season: The 2015 American Ultimate Disc League season was the fourth season for the league.  Each team played a 14-game schedule.  The San Jose Spiders won the AUDL Championship over the Madison Radicals at Avaya Stadium in San Jose, California.  The Spiders won the championship despite entering the final four with the lowest seed after a regular-season record of 10-4.

2016 American Ultimate Disc League season: The 2016 American Ultimate Disc League season is the fifth season for the league.  The twenty-six teams were split into four regional divisions (East, Midwest, West and South), with each team playing a 14-game schedule.  The second and third placed teams in each division advanced to a playoff match, with the winners facing the first placed team in their division.  The winners of these matches advanced to the AUDL Championship Weekend, which featured semifinals and then a final for the AUDL Championship.  Dallas Roughnecks defeated Seattle Cascades 33–27 in the final to become the 2016 AUDL Champions.

Philadelphia Spinners: The Philadelphia Spinners were a professional ultimate team based in Philadelphia, Pennsylvania.  They were founded in 2012 as a team in the American Ultimate Disc League (AUDL), but then moved to Major League Ultimate (MLU).  They played in the MLU until the league was suspended in 2016.  Their home stadium was Carey Stadium at Germantown Academy.

Pontiac Silverdome: The Pontiac Silverdome, formerly known as the Silverdome, is a stadium in Pontiac, Michigan, United States, which is a suburb of Detroit.  It opened in 1975 and sits on 127 acre of land.  When the stadium opened, it featured a fiberglass fabric roof held up by air pressure, the first use of the technique in a major athletic facility.  The roof has since been destroyed.  With a seating capacity of 82,000, it was the largest stadium in the National Football League (NFL) until FedExField (91,000 capacity) in suburban Washington, D.C., opened in 1997.

Philadelphia Spinners 2012 season: The 2012 Philadelphia Spinners season was the inaugural season for the franchise, and their first and only in the American Ultimate Disc League (AUDL).  The Spinners went 13-2 in the regular season to claim the number one seed in both the Eastern Conference and the league.  The Spinners won the inaugural AUDL championship at the Silverdome in Detroit, MI 29-22 over the Indianapolis AlleyCats.

Supporting paragraphs: 2012 American Ultimate Disc League season Pontiac Silverdome
Answer: Michigan