re: all time records? "modern era" of football? what's relevant?

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...how would you define the modern era of football?

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Personally, I'd define it as from 1965 onward...that was the beginning of the 2-platoon (unlimited substitution) era. Prior to that, you were very limited in substituting and most players had to play both ways...

While there was a period of 'bout 10 years, from around '40 to '50, where 2-platoon was implemented, they went back to 1-platoon in the early '50's. When the NCAA enforced the 2-platoon system again in '65, college football, as far as having separate offensive, defensive, and special teams units, has pretty much remained the same...