This was meant to be a chapter in my new book The Fix is Still In: More Corruption and Conspiracies the Pro Sports Leagues Don't Want You to Know About. However, in putting the book together, I kinda forgot I had worked this up for inclusion (books take a while to write). So, consider this a "bonus chapter" even though not much is really written here as was originally intended.

Basically, this is a list of all the NFL and MLB teams, when they built their newest stadium (or had it renovated) and the success each franchise "coincidentally" enjoyed around that stadium's opening (or re-opening). What you will see is a fairly direct correlation between a team "needing"/wanting a new stadium and winning. Remember, too, that when a new stadium is announced, it will be at least a year before it actually opens, so when you see a team's good fortune occur before the stadium opened, that result is still tied to the stadium's opening. I think this list speaks for itself.

(I did not include NBA and NHL teams because there hasn't seemed to be any connection between those franchises and new stadiums. The "or else" demand -- we'll move if we don't get our way/our stadium -- always seems to be with NFL and MLB teams.)
MLB
Atlanta Braves                      
Texas Rangers                      
Chicago Cubs                        
Miami Marlins                        
Minnesota Twins                     
New York Yankees                 
New York Mets                       
Kansas City Royals               
Washington Nationals            
St Louis Cardinals                  
L.A. Dodgers                            
Philadelphia Philles             
San Diego Padres                 
Cincinnati Reds                    
Pittsburgh Pirates                
Milwaukee Brewers              
Houston Astros                    
San Francisco Giants            
Detroit Tigers                       
Seattle Mariners                  
Arizona Diamondbacks       
Anaheim Angles                   
Colorado Rockies                 
Cleveland Indians                 
Baltimore Orioles                
Chicago White Sox              
Tampa Bay Rays                   
Toronto Blue Jays                
Oakland A’s                        
SunTrust Park (2017)                   
Globe Life Park (2020)      
Wrigley Field (2014*)                              
Marlins Park (2012)                                    
Target Field (2010)                                      
Yankee Stadium (2009)                              
Citi Field (2009)                                       
Kauffman Stadium (2009*)                       
Nationals Park (2008)                                 
Busch Stadium (2006)                                
Dodger Stadium (2005*)                           
Citizens Bank Park (2004)                          
Petco Park (2004)                                        
Great American Ball Park (2003)                    
PNC Park (2001)                                           
Miller Park (2001)                                       
Minute Maid Park (2000)                   
AT&T Park (2000)                                      
Comerica Park (2000)                                 
Safeco Field (1999)                                     
Chase Field (1998)                                       
Angel Stadium (1997*)                               
Coors Field (1995)                                       
Progressive Field (1994)                             
Oriole Park at Camden Yards (1992)             
Guaranteed Rate Field (1991)                       
Tropicana Field (1990)                               
Rogers Centre (1989)                               
Oakland Coliseum (1966)                          
Won World Series 2021
Lost LDS 2015, 2016
Won World Series 2016
None
Lost LDS 2009, 2010   
Won World Series 2009
Lost World Series 2015
Lost WS 2014, Won WS 2015
Lost LDS 2012, Won WS 2019
Won World Series 2006
Lost LDS 2005, Lost NLCS 2008, 2009
Lost LDS '07, Won World Series '08
Lost LDS 2005, 2006
None
None
Lost LDS 2008
Lost LDS 2001; Lost World Series 2005
Won World Series 2010, 2012
Lost World Series 2006
Lost ALCS 2000, 2001
Lost LDS 1999, won World Series 2001
Won World Series 2002
Lost LDS 1995
Lost World Series 1995, 1997
Lost ALCS 1996, 1997
Lost ALCS 1993            
Team founded in 1990               
Lost ALCS 1989, Won WS 1992, 1993
Won World Series 1972, 1973, 1974

NFL
Atlanta Falcons                
Minnesota Vikings              
Miami Dolphins                   
San Francisco 49ers           
Kansas City Chiefs             
NY Giants                          
NY Jets                              
Dallas Cowboys                  
Indianapolis Colts               
Phoenix Cardinals               
New Orleans Saints            
Philadelphia Eagles             
Chicago Bears                      
Seattle Seahawks                
New England Patriots           
Detroit Lions                        
Houston Texans                  
Pittsburgh Steelers             
Denver Broncos                  
Cincinnati Bengals              
Cleveland Browns               
Baltimore Ravens                
Tennessee Titans                
Tampa Bay Buccaneers     
Washington Redskins         
Carolina Panthers               
Jacksonville Jaguars            
LA Rams     
Buffalo Bills                          
Las Vegas Raiders
LA Chargers                 

Mercedes Benz Stadium (2017)               
U.S. Bank Stadium (2016)                        
Hard Rock Stadium (2015*)                      
Levi's Stadium (2014)                               
Arrowhead Stadium (2010*)                      
MetLife Stadium (2010)                             
Metlife Stadium (2010)                              
AT&T Stadium (2009)                                
Lucas Oil Stadium (2008)                           
University of Phoenix Stadium (2006)          
Mercedes-Benz Superdome (2006*)            
Lincoln Financial Field (2003)                   
Soldier Field (2003*)                         
CenturyLink Field (2002)                        
Gillette Stadium (2002)                             
Ford Field (2002)                                                   
NRG Stadium (2002)                                 
Heinz Field (2001)                                     
Sports Authority Field (2001)                       
Paul Brown Stadium (2000)                       
FirstEnergy Stadium (1999)                      
M&T Bank Stadium (1998)                         
Nissan Stadium (1999)                               
Raymond James Stadium (1998)             
FedExField (1997)                                        
Bank of America Stadium (1996)                   
EverBank Field (1995)                                 
SoFi Stadium (2020)  
New Era Field (1973)                                        
Allegiant Stadium (2020)
SoFi Stadium (2020)    

* denotes year of major renovation to stadium, not original construction
Lost Super Bowl 2016
Lost Wild Card '15, NFC Champ '17
Lost Wild Card 2016
Lost Super Bowl 2012
Lost Wild Card 2010
Won Super Bowl 2011
Lost Conf. Finals 2010
Lost Divisional round 2009
Lost Super Bowl 2009
Lost Super Bowl 2008
Won Super Bowl 2009
Lost Conf. Finals '03; Super Bowl '04
Lost Divisional '05; Super Bowl '06
Lost WC '03, '04; Super Bowl '05
Won Super Bowl 2003
None              
Team founded in 2002               
Lost Conf. Finals 2001
Lost Wild Card 2003, 2004, 2005
None
Team Founded in 1999
Won Super Bowl 2000
Lost Super Bowl 1999
Lost Conf. Finals '99, Won SB '02
None
Lost Conf. Finals 1996
Team founded in 1995               
Lost SB 2018/Wild Card 2020
None    
Relocated in 2020
Relocated 2017/Lost Divisional 2018