Hi!  I've gotten into veganism recently, but it seems like veganism isn't really an old thing.  It must've not existed 100 years ago.
You might be shocked to find out that it has roots in the civilizations of ancient India and ancient Greece. 
Wow definitely color me shocked.  With india is veganism related to religion since they don't like eating mutton and cows?
Yeah, in both cases the diet was very closely connected to the idea of nonviolence towards animals.