Why were the 1800s so crazy?
Because of Hairriet Tubman.
I only made so it's the 69th in the hair category.
This is a pun, playing on the similar sounds of 'hair' and 'Harriet'. The punchline 'Hairriet Tubman' is a humorous twist on the name of the famous historical figure Harriet Tubman, creating a silly reason why the 1800s might have been considered 'crazy'. The follow-up is a meta comment on the joke's category, referencing the number 69, which adds a bit of immature humor.