Looking at football national championships from 1981 through 2018, it seems to me that the narrative of "ACC football isn't very good" just isn't very accurate...
'81 to '90 - [Modern] ACC rising.
1981 Clemson Tigers
1982 Penn State Nittany Lions
1983 Miami Hurricanes
1984 BYU Cougars
1985 Oklahoma Sooners
1986 Penn State Nittany Lions
1987 Miami Hurricanes
1988 Notre Dame Fighting Irish
1989 Miami Hurricanes
1990 (shared, unjustly) Georgia Tech Yellow Jackets; Colorado Buffaloes
Yes, I know - Miami wasn't actually in the ACC in the 80's, and Notre Dame still isn't in for football - but this decade certainly laid the foundation for what is now the modern ACC.
'91 to 2001 - Sunshine State dominates.
1991 (shared, legitimately) Miami Hurricanes; Washington Huskies
1992 Alabama Crimson Tide
1993 Florida State Seminoles
1994 Nebraska Cornhuskers
1995 Nebraska Cornhuskers
1996 Florida Gators
1997 (shared) Nebraska Cornhuskers, Michigan Wolverines
1998 Tennessee Volunteers
1999 Florida State Seminoles
2000 Oklahoma Sooners
2001 Miami Hurricanes
The 90's and very early aughts witnessed 2 national championships each by FSU and Miami, with one Gator natty tossed in to solidify the Sunshine State as the capital of college football during this decade.
'02 to '05 - Wild West.
2002 Ohio State Buckeyes
2003 USC Trojans
2003 LSU Tigers
2004 USC Trojans
2005 Texas Longhorns
For this 6-year span it was mostly teams West of the Mississippi River (with one unearned title for Ohio State on a bad PI call in overtime).
'06 to '12 - SEC dominates.
2006 Florida Gators
2007 LSU Tigers
2008 Florida Gators
2009 Alabama Crimson Tide
2010 Auburn Tigers
2011 Alabama Crimson Tide
2012 Alabama Crimson Tide
Whether this was legitimate domination or the creation of the ESPN hype machine, I'll let you be the judge - but there's no denying the SEC took home 7 titles in a row.
'13 to now - ACC rises again.
2013 Florida State Seminoles
2014 Ohio State Buckeyes
2015 Alabama Crimson Tide
2016 Clemson Tigers
2017 Alabama Crimson Tide
2018 Clemson Tigers