Therefore, the forests that are providing today’s forest resources got established before there were high deer populations or in many cases even low deer populations that could prevent them from regenerating.
That is today’s forest/wildlife history lesson.
You must be confused , because that was actually the joke of the day, not a history lesson.
According to DCNR a mature northern hardwood is 80-100 years old ,which is why they harvest 1%/yr. That means the 100 yr/ old oak that is cut today was a seedling in 1928 ,when there was so many deer the PGC closed buck season and only allowed the harvest of antlerless deer.