This video is considered an updated version of the original by a user called ‘Elina T’:    • 110 Years of High School: 1900s2010s   which goes up to the 2010s. This video adds on an extra decade of the 2020s that the original missed. Also, to differentiate this vid from the original, different footages and songs have been used for each decade instead hopefully giving this vid some point to be watched.

Below is every footages used for each decade:

1900s: https://www.loc.gov/item/mp73079000/ https://www.loc.gov/item/00563596/
1910s: https://www.shutterstock.com/video/cl... https://www.shutterstock.com/video/cl...
1920s: https://www.shutterstock.com/video/cl...    • Time To Remember  Teenage Flapper  1...      • Harrow School Celebrates Founders' Da...  
1930s:    • High School in the 1930s      • Physical Fitness (1936)  
1940s:    • Maintaining Classroom Discipline (1947)      • 1945 Teenagers Leave High School 2214...  
1950s:    • 1950s Teenagers Discuss What Makes a ...      • 1950s USA High School Dance      • Vintage 1950s High School Classroom E...      • Video  
1960s:    • Waukegan High School 1964      • High School Fitness (1962)      • Council High School Circa 196768  
1970s:    • Radford High school 1970      • Palisades High School  1975      • Film Yearbook 1976      • Fun At School  1970s Super 8 Film by...  
1980s:    • Goodpasture 1984 Last Day of School 1 2      • Golden High School Video Yearbook 198...      • Video      • 1987 CBS News Report on Beverly Hills...      • A Day at Sierra High School  April 1...      • May 31st 1989 Last Day of Comstock Hi...  
1990s:    • Frenship High School  Class of 1992      • Zane Trace High School Seniors Last D...  
2000s:    • Class of 2004 Chamblee High School Se...      • One day  of high school in 2004      • Video  
2010s:    • This School Locks Up Students' Phones      • Cell phone study among college students      • High School Vlog #1 First Day of School!      • A Day in High School (Vlog)      • a ~crazy~ day in high school      • EPIC BOTTLE FLIPPING IN SCHOOL!  
2020s:    • Video      • CRAZIEST/FUNNIEST ZOOM FAILS OF 2021 ...  

Phew! And that was everything I had to write in the description!