This '70s' bush thing, did women not have pubic hair before the 70's then?
Not according to John Ruskin... (That's all a myth anyway, apparently.)
Yes, of course they did. Just look at some Victorian porn. Other art forms will mostly have a tastefully draped bit of cloth or just a sort undefined blur round that bit. Until you get to Courbet and L'Origine du monde, of course.
I remember reading a Wordsworth Classic Erotica book written and set in the 1920s, and they all have some sort of orgy where they set to with the shaving foam and a razor. I imagine it was a cut-throat razor type (first safety razors from the 19th century, but I don't know how widely they were used.) Can't remember the author (which may well have been Anon) nor the title, but it's not worth searching out anyway, it wasn't very well written.
Shaving was also used as part of lice removal by some, though don't know how widespread this was. Probably not very, given the lack of access to safe water supplies, decent lighting and good razors till comparatively recent years. I'm not sure it's something you'd want to attempt by yourself with a cutthroat razor, a ewer and bowl of cold water and flickering candlelight, but that's entirely speculation, and I could be quite wrong. I would suspect it was mostly only prostitutes, anyway - and that's apparently where merkins started out. (Apparently pubic lice are under threat in the UK, because of the fashion for shaving and subsequent loss of habitat.)
Also, the risks of a cutthroat razor blade are probably less if you use one often and are proficient. I am just making assumptions about how dangerous it would be for me to use one, and they may not be half as bad as all that, if you know what you're doing.